Hello everyone and thank you for attending today's webinar. Geotechnical engineering for embankments. Before we begin, we wanted to cover a few housekeeping items at the bottom of your screen or multiple application widgets. You can use all the widgets are re sizable an movable so feel free to move them around to get the most out of your desktop space. You can expand your slide area or maximize it to full screen by clicking on the arrow's in the top right corner. If you have any questions during the webcast, you can submit them through the QA widget. We will try to answer these during the webcast, but if a Fuller answer is needed or we run out of time, it will be answered later via email. Please know we do capture all questions. Additional help materials are available in the resource list. We encourage you to download any resources or bookmark any links that you may find useful. 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Hawaii thank you for joining us are thought leaders are excited to share our new digital workflows. An accelerated capabilities with you. I'm Cindy Ross and I will share a quick overview. We will provide an update on Bentley geotechnical engineering and multidiscipline workflows. A quick reflection on some. On some of the challenges of embankments. A presentation demo by Marina Unlimited equilibrium analysis. A presentation and demo by Misha on finite element analysis and we will close with a summary and move into our Q&A High Marina. How are things in Brazil today? Hello Cindy, everything fine here thanks. Thanks everyone for presents today. Hi Michelle, how are things over in the Netherlands? Thanks, I'm doing good great ship. Excited to show off. A few things today. Awesome, well let's get to it so. For today's infrastructure demands, geotechnical considerations are at the forefront as infrastructure assets are crucially linked to sub surface environments. They're vulnerable to geotechnical risk. Bentley has proudly expanded our portfolio in geotechnical engineering. As we dig deeper for safer solutions. Plexus soil vision Gunt Kinetics an open ground. Work together to ensure you have access to geotechnical data and analysis to support your safe solutions and data driven decisions. Geotechnical. Engineering is at the foundation of any project and therefore part of many solutions. Whether you're focuses embankments or liquefaction, soil structure interaction, or suction buckets, landslide risk, or deep foundations, we work on continuous improvements with the most accepted methods. You can conquer any common or complex infrastructure challenge with confidence. Trusted information supports planning digitally faster, anytime anyplace. Drive efficiencies with multi discipline work flows through the entire project lifecycle. Advanced expertise with sound computation for your trusted workflows will guarantee success. Project consists of many steps, an average geotechnical project requires integration of many data sources, ensure utilization of all data sources in one piece of design with the digital twin. Digital Twins can spend your entire life cycle asset, the entire asset lifecycle, starting as a project digital twin and eventually becoming performance digital twin. You can plan. Design, analyze, construct and operate with geotechnical subsurface digital workflows. Challenges that effect. The stability of embankments can include designing against loading and localize subsurface conditions. Designing on soft compressible soils with low permeability of the underlying deposit together with low undrained shear strength can present risks. Additional challenges include dynamic movements of embankments, loading conditions, overall stability, as well as the migration of finer materials during the long term operation of an embankment. As we all know, embankments are required to meet design factors of safety standards which can be assessed by numerical models that employ limit equilibrium and finite element methods. We hope to share our ways of making the successful with you here today. Throughout the presentation, we're going to try and keep you engaged with a few poll questions. This one is just for fun. I don't know about you, but my family's been catching up on a lot of movies lately, and so this question comes from my son. You will simply answer the poll question and will show you the results. Who is your favorite Star Wars character? Is it Luke Skywalker, Han Solo, Chewbacca, or Yoda? Simply select one of the buttons and press submit. Give you a minute to finish that up. Have you had a chance to play along? We will do some more throughout here we go. Clearly, with this very smart crowd, we have Yoda as our leader, so I think that's very true. Telling result thanks so much for playing along. Will have a few more pull questions through our web and R and now I'm turning it over to Marina. Hi Marina. Hi Cindy, thank you for this amazing overview and this amazing question as well. So I think one of our remain goes Mingo today is really talk about the solutions available in Bentley related to limited Cleary Analysis, an feeling element analysis for embankments directly as we're going to show you some demos and we will have at the end of a discussion about. This subject I just would like to present also an overview about the solutions that we're going to use and how they can help you out during your daily work. So today we're going to present a bit about SV, slope 2D and 3D. As his llopis part of so vision, family of software and is a solution there where you can perform your limited killebrew analysis both into the entry the as a whole integrated suite. So basically you can perform at the terministic in probabilistic analysis, office stability first saw you in rock slopes. Also the main results that you can get from Asheville slope are the factor of safety. Or for example you can have one 1.5 those represents a certain type of. Uh security related to your your analysis, the probability of unsatisfactory performance or the reability index can also be calculated when we are dealing with probabilistic analysis, both in 2D and 3D So what are the common is loop stability analysis performed by geotechnical engineers nowadays you can definitely use for embankments orfeus levies you can use for tailings them open pizza powered EMS can structure. Also, you in rocks, so, uh. All of the areas related to his look. Somebody analysis can use the capabilities of the limit Rick liberal method and what is the limited Librium method here is just a short overview of using the this type of analysis. Basically the main goal is also to determine the factor of safety. So you basically have the possibility of dividing your problem, your slice into a series of slices and should be or a series of columns into. Intrigued, treaty an with that with the old forces in moment moments being applied in your. Slope surface you can solve the D analysis using the Statical Colibri am or forces and moments we have several methods to support this. Some advanced ones that use the forces in moments coupled or just some things that are just using forces or other. Just using moment. You can compare several methods and see which of them are more realistic. Realistic in terms of. Uh-huh the representation of your vector of safety for an specific analysis. So basically the equation of equilibrium is then solved for each of these slices. Each of the columns you can map this during your analysis beside besides the solving the equations, we also have the influence of the sheer forces mobilized in our slope mass, and this specific sheer force has the influence of the sheer strength parameter. So weird. Talking about the effect equation, the angle angle of internal friction pour water pressures being applied in your model, normal stress is acting on the basis of your his lies. Everything can be then analyze for each of your slices and columns and this method has a long story of experience and there's also several research available related to this specific. Method for slope stability analysis. I think one of my ideas today with this webner is show you an advance capability available in Nashville slope to perform limited killebrew analysis in really large areas. When we start to deal with 3D modeling with when we start, you apply the limited clear analysis in a really large model. We're talking about kilometers of extension. Sometimes it's image become a bit time consuming to analyze it. Each of the regions separately so without the EPA which is the most plane analysis. You need to analyze one location. At one time and set up a series of analysis for example, along a page or in this case, from San Francisco side for separated regions. And of course. It is time consuming and it will take a long time to finally have an answer about the most. Creative Co area. She then had really focused on a more detailed analysis. So based on this challenge an the necessity of moving our analysis also to do 3D World inside a vision in Asheville slope. There is a tool called multiplying analysis we call an MPA where you can perform. An analysis in large areas in multiply, multiply locations and directions at once so you can use the includes the part for inconvenient tools that we already have as the limit Librium approach. So the search methods everything can be used in the MPA chew and then you don't have a restrictions in terms of analysis, complex complexities you can apply distributed laws. US is Mika brooch. Things like that that will some point somehow influenced directly in the in your analysis. Besides that another challenge that we have nowadays related to moving to the 3D analysis. It actually built the 3D model. How you're going to create a realistic representation of your site when you have so much field data. So much. LAB lab. Test everything you need to combine to one side. And make it look realistic, uh, in for disposal. We have as we designer, which is another solution in mentally. Basically as designer is a 3D geotechnical conceptual model. You can compile, visualize and used it. The information from your site to build your 3D conceptual model using surface is grid. You can also include kilometers, bar hosts, everything there is convenient to you that you have in your hands. To make it look as most realistic as possible, and besides that not only analyzing the modeling 3D, but if you like to switch to 2D, it's also possible when you have everything done with us we designer. So this is the mango of this solution. And for the demo we're going to present today. Actually, I'm going to show the integration between S designer, an SV slow with passive designer. We're going to build a 3D conceptual model. Of this specific reader bank site, uh, and with this realistic representation we're going to use the the model not only in SV slope but also in Plex is as well plexus ready. During the step related to SV slope 3D, we're going to apply the MP analysis to obtain the 3D factor of safety contour map in an area within 18 square kilometers. So it's a really large model an you can see the benefits of using such a such a tool that will help you not only save time, but also have more be felt more confident about what you're getting as a result. So based on this overview of the solutions that we're going to use it until now, just summary related to two SV slope and using limited colibri analysis. It's a very well known solution. Since 1912 we have as I said, a long story of experience related to this method, so vision there also a lot of methods and conservative models available to to support your analysis. We see that these loops ability analysis St. Entreaty is growing rapidly so Ari idea is really to support the whole workflow for you. Anne make you feel comfort rible specially when you're dealing with the compared with comparisions of 2D and 3D and building the 3D conceptual model as well. Also, the limited Librium will give you the most critical failure mechanism. It can be circular, noncircular, composed, shape, but also all the trial zipser faces related to this model, so you can. Have a serious of a factor of safeties and compare each of them and then refine your analysis based on some assumptions. The method is also easy to you, will see at the demo and computationally speaking. It's quick to perform even for deterministic and probabilistic approach, which is even more required nowadays when we're talking about hazard assessment. So it's over to my trainer. Thanks so much and for giving us that intro so marine is going to do a demo for you. And while we get that set up, I'm going to give you another poll question. So get your clicker is ready. Which method do you use? Limit equilibrium finite element? Both or none of the above? Will give you a few minutes. I was thinking marine about what you said and I remember when somebody said something about you can do thousands. In hours versus a few so it's at MPA capability is really something I think is. Fascinating development, so thanks for sharing it with us. Hope we've had enough time to answer and for the drum roll both this is great. So all of you will be able to see how you can use this in an embankment analysis. Thanks so much for joining in the pool question and now I'm going to turn it over to the demonstration. For the riverbank model, we have used as a designer, which is this platform here to build the 3D conceptual model so you can see the that we already positioned the water surface in the model. Also the tops surface geometry and also the layers related to this specific example. Right after that we have developed the module volume in order to make sure that we don't have been child's an. We have exactly what we're looking for in terms of. How to use an extension of this model? So right now we're going to create these very slow model. Directly in the generate model 2 and I'm going to call it. Redeem riverbank model example. When we generate a model from SV designer chooses low porous reflux for instance. Basically uh, the the analysis module will have all the surface is in regions developed in massive designer. As you can see here they are all important in Nashville. Slope for us in this case where we're going to do today is analyze the whole River bank model. Uh, and have our factor of safety contour map. In order to do so, we have to find some settings, materials, etc. So basically we're going to handle the whole workflow available here in the menu of slope. So we're going to click and model settings and you have. Actually the user has several options in terms of defining the search method, the calculation method, etc. When they want to specify only one region to analyzing details, also including wedges and weeks are faces. In this case, we're going to use directly demote plane analysis, and we could analyze at 3D model with 2D or three D3 Dimensions. In this case, you are going to use a 3 dimensional analysis an I'm going just to define some changes here in the solution start settings in order to to have better resolution of our model. Terms of the calculation methods we're going to use Glee from Fred Lynn, which considers the deck Librium of forces and moments, but we could also pick another at different one and see the senses sensibility between the factor of safety using one method an in order. So I'm just clicking here OK, and I need to find the materials of my model as well, so I'm going to materials manager Ann I need show applies this tree. It's true strength parameters and also the conservative model related to them. In this case we are working with two layers as we were talking before. We're going to call the first one and stopped few in bank men using Marco lump. We have other options available as well, and we're going to define right now the strength parameters, which is specific material. The second one, which is the existing River soil, the same. OK, I could bring the important information from another's views, look, model or another type of source. There are several options to include information in the softer, so now we're going to apply the material for our model as we are dealing with a layered cake between 2 surface is we can apply material an in this case as we only have one region, then the material will be applied in the entire. Region so top few embankment and the existing rivers soil as you can see a Winkler. Decide photo, nicer designer and the side photo is right here with our model as well. In the top surface we already have the materials included an now what we need to do is make sure that the power of other pressures are also included in this model. So I'm going here in power water clicking settings and we've created water surface. So I click here. I can see that they all the coordinates. That we were dealing as designer as a grid. It's also here and I can just click here in the format that you show. Change the show few. I just can cancel if I want. Uh, an I can apply here for one or two materials. In this case, I'm going to apply the pour water pressures for The Chew materials. Click OK. OK, and now I'm sure that I'm working in terms of the influence of the water surface as I need to select the entire area of the riverbank to analyze. I'm going to use in model, demote, play, analysis option. We're dealing with limited Cleary analysis, but in this case we are we are able to analyze the entire model with only one one only one run. So in this case I can. I will create a multiple multiple multiply planes. The distance between these planes are 40 meters and I can draw the Dis Plaines in different ways in this case. Here I'm going to draw a polyline in the exact exact location that I want to see the factor of safety. Double click an I will as you can see I have several planes. The distance between between all of them is 40 and we have this centroid located here and also several models that will be analyzing 3D at the same time. In this case I I just wanted to take a look at the slope limit in the riverbank region, not including the urban area. So far these lies that I just need to pick up them and select the search limit. Drawing a Polygon as well. So in this case going to draw Polygon just around. The riverbank an not including the. Houses etc. Because this is not part of our analysis here. Double click and then you can see that these slices are exactly as we want in terms of decreased in two. To analyze these loop also the search method that we're going to use. In this model you can select several options. I'm going to use these loop search and I'm going to change here number of surface two 600 and also the minimal aspect radio to 0.5. And chew, which is related to degrade surface of our model. Click OK. And then I'm not considering any loading an in distributed loading are Seesmic conditioning. This model also I'm not applying support, so nailing incurs etc. Just going out to analyze all of the the planes owns OK. When we do that, we have here the VS lope MPA analysis running basically the the MPA solvers makes full use of all the CPU power available on the system, which allows for Rep rapid interaction. OK, so our model took about 7 minutes to analyze and you can see here all the factor of safety is obtained in 3D for all the plane is. So now we're going to visualize what we got as result here. Actually, the minimum factor of safety is already showing us. And what we have in this case is a factor of safety of one point. 17 in this specific location, if you like to see it in more details related to decide photo, I just can't click yourself surface. This place I photo and then we know that this is the critical region of our model. Coming back to us with designer, I just brought the top surface from SV slope with the critical is lighting mess an what we have done in this case is just re selecting this critical area with defined limit of limited region. Here where we're going to export and using Plex is as well for the same analysis. Tell you how similar embankment can be done with finite element analysis, and for that I'm asking me should it take the helm. Hi Michelle, you ready to go? Yes, I'm ready to go after this exciting great 3D limit equilibrium. Indeed, uh, with. Method we can also calculate the slope stability of such an embankment, but not such a large area. So after getting the detailed results from this multiplane analysis. We can switch over to our finite element calculation to perform a 3D three dimensional analysis that can include information instability in geotechnical engineering. So including R factor of Safety Latches. 3D is typically used for excavations, embankments, foundations, but also tunneling mining reservoir due mechanics, offshore applications. So it's very wide application that we can use our final download calculation which covers deformations, an strength and stability. Is Maria mentioned? One important aspect is to get your site data into your model. Within plexus we typically can define are just using world inside data to the divine stores source. We can import multiple bore holes. We can define a manually, we can import them from the technical information applications as gained an kinetics. I think that we can also import services that open intermediate services that we've seen here today will also be important. We can import from step the FCB rap file formats and also point clouds. If you have, like a lighter data, you can also import that into plexus. And we can import the top surface into our borders directly to get the upper boundary layer. And of course with the automation API options, we can also make extensions that will help you further automate automation, teach the workflows that are very specific to your company. What are the considerations that we need to? Uh, do before starting such an analysis. The water level as Marina match it is important for your analysis because it has an effect on the effect effective stress, especially when you're dealing with grammar materials like sense and then the strength is dominated by friction, angle and effective stress level. Now we can import these. We can define what the levels by directly in defining them. Bortles, we can run a groundwater flow analysis, or we can import the groundwater conditions. Fear measured data. Uh, using a water surface? So how does the fan down with method is different compared to the limit equilibrium methods? Defined element method uses a method called strength reduction, and it means that actually gradually reduce the strength Indian in the entire model until we cannot reduce the strength anymore. This requires that we need to start with the proper stress definition because the. Affective stretch will determine the available strength when you're dealing with a frictional material. We can start to do face calculations to determine distressed state. To get a realistic stress state based on history of the real side data, we can include the stress history but also consolidation steady state training ground with the flow and we can include structural elements for sure structure interaction. And then this factor of safety determine in our final calculation is done by a strength reduction and then actually we're going to reduce the tangent of the friction angle and cohesion. So next is the How to find the same model that we had in their heads. Fish load model into practice 3D. Now when we do that, we have three different challenges. The top surface, as you've seen, is a very complex surface. Will import this as a top, serves in the borrow. Second challenge is that the layer boundary between the Philana Natural River soil is also a complex surface, so we will import this separately. And finally, the water conditions as they come from site investigation with a point grid data we will also import this water surface as as is. So let's get started with the demonstration. Thanks, Misha. We're just ask a quick poll question. So as we get ready, we're going to watch into which dimensions are you applying in your projects. 2D3D4D all of the above. Thanks so much Michelle. That was a great overview and we're really looking forward to your demo. So we have a large. Large use of 2D so that combine 2D3D analysis can be really useful and I love seeing a little bit of 4D. So to build off that. Did any of you ask yourself what is 4D? We're asking you for honesty. Great will show you the poll results on them. Look at it. Started with niche demo. Perfect well we look forward to sharing that it with you in further and further webinars down the road. I would've probably said maybe but won't admit, but I'm just kidding. So Optimises demo. You ready to go Misha? Restart pleasure 3D and get the quick slide window. Let's start a new project. The name we give Ruby here embankment study. And in the multiport, let's go to the next. The model part. We can set the appropriate units. And the main dimensions of the project. To generate a short layers, we will first create a borehole. The bottom of the model is located at. The jet is minus 15. So let's add that one. And we will use import to the server. So here we using arbitrary top elevation of 100 meters. Then we import it up, service the input window here. She like the file, the input window gives out the preview of the surface to be imported. By clicking OK, this surface will be applied to a model. As you can see here. We also need to define the show materials here. In the material database you can create and edit material datasets. Here we have two the existing River soil. And the top few embankment. We can feel properties as weight, stiffness in string parameters. And then we shine the material by simply a drag and drop action. And the material has been assigned. Then we will import the intermediate surely boundary we can import. As point cloud or as in this case, a single the exact service. He was selected show layer boundary DXF. It looks like this. Will use this as is without any scaling and then the service will be imported into the model. The service will cut the Lord Short block in two parts. When we go to the next modes. Now it's time to set up the complete initial state of the model in state construction. Here we shut up the proper layering. We should let it offshore layer and assign the top fill soil layer. This can see now we have the treaty shape well defined in Flashes 3D with two show layers in this case. One other important aspect here is the Frederick level inside the soil. We can import this in the flow conditions mode where we can define all water related settings. We imported water level from a plaintext file. This text file contains point cloud data for the Weather Service and after importing we can expect the new surface. Glad to extend a bit beyond the boundaries for a better in visual inspection. generate the mesh. We control the local coordinates or fineness of the mesh as a rule of thumb we define image. We get more accurate results. To generate the mesh you will start the mesh process. And practice will start the automatic mesh generation process with these settings. Here's a generate mesh is also showed generated elements to inspect the element distribution. We can also preview the model and the generated water levels to make sure we use the correct for pressure in the model. We can nicely see the Frederick service at the model boundary. Also, we can look at the port pressure distribution. We're different, few options as shadings. Oryza planes to look into the soil. Sometimes a visual inspection of the groundwater head will also give more insight. And here we can also look into the soil using hyperplanes. Now that we have well defined water service, we will set up the calculation faces. Starting with the gravity loading financial stress generation and we will add a safety face. This will include the strength reduction method to calculate R factor of safety. And when I was done, we can start the calculation process. Once the calculation is completed, we can inspect the results. To inspect the trigger, sorry medication. That's the result of the safety analysis. Visually inspect the incremental displacement and the incremental share strengths. The shade cloths give a good indication of what is happening anywhere. For incremental share strange we can look into the soil to see where the shear strain concentrations happen. At failure. Here we can also use the Azure planes display. As effective as high as a bit of what we would like to see, we can hide it. And we can also show the incremental displacements, indecisive planes display. With complex 3D structures, it's not always enough. With this Azure planes. With cross sections we can also look into the soil. With 3D models you might not always created the correct cross section. With the life cross actually movement using control plus in control minus, we can move through the model to get more insight. We can now slowly move tomorrow. Do we find the critical section with a section with the most relevant information? And once we get that section, we can manipulate the view to get some context. For instance. Where the shortly boundary is located. inside the failure zone on the horizontal access and restraint reduction factor. Some MF on the vertical axis. As you reach a plateau here after sufficient calculation steps, we can say that R factor of safety for this model is one point 16. However, it might be that our fighter safety might be a little bit too low. For that weekend, as mitigation effects and analyze it in our tree financial model. For instance, here we introduce a powerwall. As you can see here, we can also define the properties. He will see the sheet firewall. Embedded into the slope. We told that Ization to see the location over she Powell. As you can see, it's embedded in the lower shore layer. Then we have some faces to install the shipper wall and do reinforcement slope stability assessment. In the result we can check the same results. Look at that information pattern. Ah Nigel, planes. To she Howdy performance authorship of all is in this case. We can also check the results from my structural element. In this case is she power. Look at the information pattern but also have insight in structural forces by checking the bending moment results. When comparing the factor of safety for both cases, we can now see that the insulation shippable enhances our factor of safety. So I hope you enjoyed that demonstration. So you enjoy the demonstration. Could she without the shipper, will we get the same results using our limit equilibrium method in our finite element methods for this critical section? When using find out methods, there are few benefits that you get. The slip shows is totally the result of the analysis, so that you do not have to preset any of the slip planes or locations where the failure might occur. Stress changes are can occur due to undrained soil loading and the method we usually find element is the same method also allows to assess deformations. And we can also fully integrate time dependent process is like training ground with the flow consolidation an creep to take into account this. To help you assess maybe a 40 model as well. Another benefit of using finite elements is definitely the inclusion of structural elements. And so we can also assess the performance of the technical structure. We can use refinement it. With that in plexus that use structure elements combined with interface elements to allow this source structure interaction. We can also do some kind of mitigation analysis. We can add structural elements, an maybe show nailing retaining walls directly into a treaty model like we did just in this demonstration an we can obtain the structural forces here to assess the performance and see if the mitigation is successful and it's worth the effort. On top of that, we can include partial factors if you want to French want to use your code 7 ultimate limit state design and R. Are all L RFD design. So that gives you a performance based design to further optimize this, especially when you have such long Geo structures. If you can save a little bit every section that amounts to saving a lot of time and money for the entire project. To summarize, would have shown you today, uh, with so vision we had proposed the 3D workflow that included the user actually designed to compile and create realistic representation of the site. This can be coupled directly with Ashley Slope in order to increase analysis time against modeling time. The services from Ashley desire were also exported and using Plex is to support the analysis. Using Ashley Slope 3D with multiplying analysis MPA, the demonstration showed that the effective state can be applied in the model on the use of different positive models and pour water pressure did conditions. The advanced feature provides capability of mapping. The entire model in order to indentify the critical slip slip surface. Then in Plexus Treaty. We showed the few easy steps importing the services and the water level to run a safety analysis and it gives you very similar results with RSS Load. 3D Linda Colibri method. We include mitigation by installing cheaper wall to enhance the factor of safety, and we expected the results of this analysis. They can also give insight and to come to a more economical performance based design. Energy. As you can see. To announce your analysis, you can use our combined applications for both the limit equilibrium methods and find download method. And take advantage of the strong point of both methods to come too quick and economical design. Thanks so much Misha. I think it's fascinating to see them all working together. So following our presentation today we have a quick question. Would any of you like to be contacted by one of our geotechnical experts before we move on to the Q&A? You could simply answer yes or no will help us after the web and are also we will be moving into our question and answer period. And Misha Ann Marina will be available. We see lots of wonderful questions coming in. We may not get to the mall in our QA today so we may have to follow up with you right after the call, but you will get an answer from our team. Thanks so much for attending today. So Misha Marina, if you can. Uh, open up your Mike's and join me. Let's take a stab at some of these Q&A's. Sure I have a question here of yeah, which plaques is 3D meshing option is more suitable for slope? I would like this 3D. We recently introduced some advancements in the 3D matching process which allows you to control the finest Santa Control, the mass distribution and it is a fully automated matching process. I showed you in a demonstration that I refined the topsoil a little bit because I expected, and we can also see that of course from the limited method already, I expected that the top soil layer. Would show a lot of deformations when we were going to assess the stability and with that I want to get more accuracy. But there when you want to get more accuracy you get more elements and more calculation time so it will be engineering tradeoff that you have to do. So I hope that answers the question. I hope so. Will let you let let you answer if that didn't answer your question, please let us know. We can come back to it. So I have another question here. Did you consider water flow or steady water level? Hum for the platters model we imported basically a steady water level from an external source we have. Available we show in the SV slow model that we had a grid of points. We also apply the same grid in Plexus 3D and this is has been applied as a steady water level 'cause it's from actual measured data which of course is more accurate than. Doing a groundwater flow analysis. So I hope that answers the question as well. I have one here. You mentioned partial factors. How can we apply these? That's a very good question. A partial factors. And places studio we have a method called design approaches an I think I can also share the link later on. I will do that after answering this question is that the we can apply partial factors on all the parameters using our design approaches facility. So I'll share the link. Through the. Where video an A paper houses has been applied and how it relates to which is an approach in your code 7, so I hope that will help you further. And if not then please follow up. Another question, is Ken distributed load and seismic action be applied to 3D LEM? I don't know if Marina you wanna take this one or. He's going to keep going. Question is Ken distributed load and seismic action be applied to 3D LEM? Distributed load or a point load in three 2D3D model and also this is Mick action in different ways, not only a pseudo static approach but also spectral seismic analysis. Some options related should newmark, permanent displacement etc. So yes, it's totally possible. Great, someone said you did a good job showing me how to get the factor of safety and plexus, but why do I see so large deformations? Ah, that's a very good question. The final methods is driven by deformations in order to assess the factor of safety while we reduce the strength, we introduce plasticity in the model. And that will drive deformations. We have a complete one hour special interest group webinar on this topic. You can find it in the resources. And I think it's good to have a look at the resource to understand fully how the method works and why we look at the results. Also, that I showed you in a demonstration. Great. So another question here, is there a way to improve the factor of safety with Geo grids? What were related to us who slope? You can definitely use supports to increase your factor of safety so you can use geogrids. You can use Scion Elings micropiles anchors gel texture, so it's up to the user to define how it's going to be increased so, but yes, totally possible. Continue that can soil vision. Apply reinforcement structures such as retaining walls on to the model, like in Plexus 3D, yes, you can use ring for reinforcement walls. But please make sure that as a final result you're going to. Of course the factor of safety and also the forces mobilized along the sports. But yes. Great. How can we consider geos geosynthetic reinforcement? Is it possible in these solutions? Well from from so yeah go ahead. No, just saying that, Uh, Yeah, following the same idea of the the other answer, yeah, it's possible to apply actually in 2D you can apply as a line segment, for example, or in 3D you can have some regions, well define where you can apply this condition, but yes, it is possible under the supports menu. Yeah, no black history in Michigan. Yeah, in fact 3D, you can model geotextiles directly. You important defining message sheet and then you can use the final calculation and then do the information that are generated in your finite element analysis. The texts will be stretched and then they will give a resistance additional resistance to help you get a higher factor of safety. Perfect how can we model a slope in plexus? We do not have SV slope. Is there an option to draw the top surface directly in plexus? Well, first I'd say sign up immediately for SV slope evaluation, but in the mean time will let me answer the question. Yeah, of course you can directly define your slope in Plexus 3D. We can just showed in the demo in my slides. Is that the you can define your own geometry using boreholes or you can define services or import services from external sources. Use point cloud data to import into clashes 3D to defines slope. I think the benefit of what we've shown today is that with slope 3D we could analyze are very large. Area which might be too large for your final download calculation. And then we could choose women into more critical areas and see more detailed what's happening in that area and maybe also do some kind of mitigation if we are not satisfied with the factor of safety that we have. But they're definitely options to directly. Great geometry and Plexus 3D, Yeah. And I'm sure you would be happy to let you have an evaluation if you click done speak to a geotechnical expert on your. To that individual. So how do you decide? Select friction angle, veils and cohesion values. Is there any factor safeguarding against earthquake vibrations? Question Mark. OK, is it for the division? It actually just gave that question, so I think anybody go ahead. I know we take sides with into consideration, so yeah, actually, if you want to select or decided friction angle, you have several conservative methods methods available in both solutions, so each of them are for different types of soil and rock behavior. For example, drain, undrained conditions. You can obtain the friction angle from from lab tests, for example, or for. Literature and then included directly in your model in terms of earthquake vibrations for a limited Cleburne approach, it is supported. It's possible to handle this and several approaches available now. We fast with low. I don't know if you'd like to include something else for this question. Yeah, I think it's a very interesting question, I think, especially when you go through finite element calculation, you want to calculate with the true values that you have. From that you got some side and imply a real earthquake simulation to see what's happening and the question is, do you just want to have something to assess based on the stability or do you want to want to include liquefaction analysis? And in that case you should use specific constructive sorry models. It can include this kind of. A phenomenon that happens with during liquefaction and the buildup of accessport pressure due to repeated cycles. And we can do that. For instance, you should you be sent or PM for sent to help you assess liquefaction risks with that, so it depends a little bit on what you want to achieve and what type of show are you dealing with, how to model this. But yeah, both. Download method both can give you options to include static, static or full dynamic applications. Great, could we model a drain surface in the plexus to stimulate geocomposite? I am that's a good question. Uh, yes, we can model drains in Plexus 3D, and the question is always what you want to achieve with this. If it's about making sure that if you have a overburden of accessport pressure, or if you want to make sure that your grandmother flow will not erodes any of your embankments or dance, then you can just include include draining elements. Or you can use volume elements with increased probability and with that you can. Run your grammar flow analysis an get the proper distribution of your precious without getting into risks of local erosion. Cindy Yes, just related to the other question of the term. In effect, the friction angle just came to my mind here that it's also possible to use back analysis to back analyze filter. For instance, if you don't have the, you don't know the issues are influencers at the exact moment of the failure, for example. So this is also possible with limited Librium. Perfect so I wanted to let everyone on the call know that thank you so much for joining us we do have quite a few more questions our team is happy to stay on and go through them but I know some of you may have other obligations so from the whole team of us who've been here today to talk about embankment solutions we want to thank you for your time hopefully you found some value out of our session and please feel free to contact us if we can be of any further assistance so for those of you have to drop off have a fantastic day and for the rest of you stay and will just keep going for another 10 to 15 minutes. So the next question I have here is. What extra parameters do I need to perform finite element? The deformations and strange with that we also need stiffness parameters to do that. If you just interested in. Ability. A simple single stiffness parameter would be sufficient if you want to assess more in detail the historical behavior or you're interested in creep behavior. Consultation in might want to have a bit more details on that, so it's mainly stiffness parameters that are traditionally needed because those controls the deformations. Great. Another question here is you showed me how to get the factor of safety and plexus. But why do I see so large deformations? I think you already answered this one, my apologies. Yeah, but now it's good to point out that we in our resources there are few resources. We had two sick videos with go into detail of using the equilibrium method to determine the factor of safety, so that's using slope and we have the one for finite elements which is using plexus and that will both explain in detail the methods how to use, use the results and why we see the results that we see now. For instance, large deformations they are caused by introducing a real slip surface in the model. Perfect, my apologies. I didn't market answered so I'm learning this new platform just like the rest of us. So can strength reduction method be used for soil models other than more Calum and just decide there once I said more column when I was new in this job, are there restrictions on the soil models that can be used? If you look in plexus. Black is too deep, lectures 3D orchestrated models that include the strength parameter. Except for the modified can play or can have a strength reduction that includes more cool importing shore Harding. So which most time stiffness hook Brown, which is not a strength criteria based on just the angle of friction, but there's also strength reduction method for that. Charles also creep. Concrete model all those models can ever strength reduction applied. Great and. In plexus, if I wanna raise the factor of safety higher than one point 2 six what can I do? I think this is a. There's a lot of places. Maybe to start the plexus question into geotechnical engineering question is what would be the solution to announce the? Situation because if you want to get a higher factor of safety, the only way you can do that is that you have to adjust your design and get some kind of medication effects. It's not that numerical model can solve it for you, so you can have to choose which how to mitigate that simple solution in real life would be sort of to flatten the slope, but of course that's not always possible because especially River embankment needs to have a certain height in order to protect the people living at the other side of the embankment. So in that sense you have to come up with a new technical solution, and that can include, for instance, adding the shippable. It's not enough. Maybe show nailing, changing the geometry of the slope. There are many options for that, but it's. The numerical tool will give you insight of what you have designed and what it will have it, but it's effect on the factor of safety. Great, so this question comes from across the pond. I like to say and brings back a lot of memories. Could both soil vision and Plexus 3D analyze ground heave at the same time with slope stability analysis? I would say that depends what the causes of ground beef. If it's about movement of the soil, so we have like a deep sleep surface. If you want to get movement or deformations into your model, you have to go to a file down calculation. Yeah, are related to two SV slope too. Limited clear analysis if I understand it correctly. The ground he maybe you can include attention crack. Uh, in in your model and also sitting for instead of the hydrostatic force in some position regions shoot. OK, updated mesh and updated water pressure gives less settlement values more than field records and soft clay. Do you have any advice? That's a good question, but I think it depends on the cost of model that's being used in that case. If you want to really. Get captured it rude information behavior. Yes, updated mesh will give you better results, especially when he constructing a magnet where the embankment. Sort of shadows below the groundwater table, so that will actually reduce your effective weight for the part that submerged below the water table, that's a method that will help you predict better results. But yeah, you mentioned the soft clay and soft claim means that you have to be careful in how you define your constructive behavior, and specially for deformation. So do you take correct? This into account maybe all over constellation. Rachel plays a big role here, so it's hard to say just from this question. And the questions keep pouring in you guys. But I would say if you have to have a question, please reach out to our Technical Support team. Filling out a service request if you are connected user you can directly go to yourconnectedbentley.com at the bottom of that page you can find a link to ask for product support. I would also say two to keep in touch with bentleycommunityzahnerbentley.com so it bentley.com under events. We have upcoming webinars, some coming up on foundation, some coming up on leveraging or do technical data, some coming on soil structure interaction. So please keep an eye on those as well as our Bentley communities. You can find out some more information there, so I think we lost the team just to maybe answer two more questions and then we'll do our best to get back to all these wonderful questions that keep pouring in. So thank you for your engagement. It's great to see you mentioned. Sorry, my apologies. What is MPA? OK, um, I think during the demo, uh, it was a bit short. The idea of this advanced two is actually you can analyze. You can perform several analysis at one run. You have to place several planes along the model as I show and based on this plane you start your 3D analysis or your Judy analysis into the 3D model. So the idea of the MPA is actually identified. The critical area identified the changes related to the factor of safety in large models, so then you can refine this specific region applied different search methods different, for example, apply supports for this specific region. Because you know, this is the critical one. So basically you can draw planes along the model an. And I have this the sense of changes in in the factor of safety this is MPA. OK, we have a question. How does the minimum slope factor of safety computed in the 3D LEM compared to a 2D LEM? So there is some information out there. We've done a recent webinar with informed infrastructure on why 3D so some of that information be there will send you the link after, but how does the minimum slope factor of safety computed in the 3D LM compared to a 2D LYM? Yeah, this is a really good question because when people start migrating to the treaty analysis with a limited. Clear method, you certainly will see difference in the factor factor of safety of 2D and 3D. Basically because we have different conditions when dealing with 3D in terms of convex concave shapes you have the confinement tensions in the third dimension you have difference in the third dimension related should they lithology. So basically, in terms of the in SV slope, why you see that, uh, when into do you have these license in 3D? The method is the same, we're just expanding to two columns an. In this case you can face an ellipsoidal shape planner shape. You just need to define some search criteria's, but it just an expansion and in 3D you you have as a differential differentiator. Also the volume my ass in the third mention extension related sweet, but as Cindy said this webner is really well detailed about this subject. A question for Miesha can plexus handle large 3D models and analysis? Yes it can. It depends a bit on the complexity and how much accuracy you would want to have. What he saw from today's demo is if you want to start with this 18 square kilometer big model, that's probably too big for finite element calculation. If you want to get the results this week. But if you sort of like in this method, first start with amp analysis. To show me where you should pay your attention to where the most critical factor of safety. Is obtained then you can soar, speed up and only showing into those parts. Get your results from your 3D LMMP analysis. Get them into a plexus. Do more detailed analysis and that will save you a lot of time in your analysis and make things more efficient. So that means you also conserve your client bit faster in doing this. Next question, When would it be appropriate to use strength reduction using the concrete model? Can we model aging or stress effects affecting concrete? Those are two questions. I would say yes, yes we can do strength reduction, but of course strength reduction is that you take a moment in time and when we refer back to our 40 analysis, we take one moment in time. And at that moment in time we calculate the factor of safety. If you want to include aging affect and stuff like that, then we have to make sure that we do plastic calculation or constellation type calculation if you also want to deal with that in your shorts and with that time progresses and when time progresses we can model this aging effect. Great, well as I said, thank you so much. The questions keep pouring in, but for the sake of time I think in less mission rena you see any there that we can answer quickly? We should probably. But you guys get back to your other obligations. OK, thanks Cindy. Thanks everyone for attending. It was a especially the amount of questions we got this overwhelming. It's very good that people are so interested that would say. Yeah, thank you everyone and uh. Set it to cheat the next webner there. We're planning hope to see you all of you in our nest next sessions. An will make sure to answer your questions by email you if not answer directly here in this session. OK, thank you. And just a reminder, here we have our upcoming ry I submission deadline. It has been extended so don't let me for scare you. But if you have a project that you'd like to submit into a year and infrastructure, simply go to our page. Why I bentley.com/awards and you can fill out a nomination form and be considered for our for our award ceremony. Going to be held in Vancouver this fall. Let's bearing that all of us will be able to travel. And if it doesn't have, if we don't travel, will still be doing it virtually so. By all means, please take a look at that. We'd love to hear how you're using our products and our applications in real world situation. So again, thanks from the whole team. Have a great day and will look for to seeing you on the next one. Thank you so much. Cindy Misha Ann Marina for a wonderful presentation and thank you to all of you for your questions and your participation. As a reminder, all of us have said. Feel free to throw your questions into the Q&A as we're ending. Will be sure to email you if you have other specific questions. Both of our presenters email addresses are available to you for you to reach out to them. I hope everyone enjoys the rest of their day and stay safe and healthy by everyone. Who? Already. So does that mean hoof means we're done? We're clear yet. My palms are so sweaty because I was reading all the medium questions and I didn't know if you guys want me to keep going through them or not I was like, oh I felt badly for you guys a lot. That was a hammer job. Miss for you guys to know on all of these ones that didn't get a response or need. _1590876043476

When it comes to embankments, geotechnical engineers must often design against loading and localized subsurface conditions, which can present various risks. Engineers are required to meet design factor of safety standards.

Kick your project off by importing site data into a secure and open platform. Limit equilibrium or finite element methods will solve design challenges and having both methods offer users advanced expertise in their projects.

Join our webinar to learn:

- How to easily bring in site data
- How to design embankments in PLAXIS
- Benefits of LEM and FEM methods

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