This is consistent with an actual failure surface since the safety factor is approximately 1. You should see the following:įor the Spencer analysis method, the safety factor of this slip surface is 0.99. Make sure you are in Group 1 – Master Scenario. For the statistical material properties we have the following: In Group 2, where weak layer 4 is used, we have turned on the probabilistic analysis option in the Statistics tab of the Project Settings. The statistical material properties for all scenarios in Group 1 are outlined below. Look at the weak layer 1 material and you should see the following properties: In Group 1, right-click on any material and select Statistical Properties. Let’s look at Group 1 – Master Scenario now. Each has different properties for the weak layer. There are four scenarios defined in this model. Additionally, we have already pre-defined two variables for sensitivity analysis: We have initially assigned the weak layer the strength properties: cohesion = 5 kPa and friction angle = 15 degrees. The material above and below the weak layer (yellow material) is significantly stronger than the weak layer, and has the following strength properties: cohesion = 17.5 kPa and friction angle = 30 degrees. The failure surface is non-circular and passes through a weak material layer (green material). The actual failure surface is given by the red line shown in the above figure. Select File > Recent Folders > Tutorials Folder from the Slide2 main menu, and open the Tutorial 23 Back Analysis Material Properties.slmd file.įor this model, a slope failure is assumed to have occurred. All tutorial files installed with Slide2 can be accessed by selecting File > Recent Folders > Tutorials Folder from the Slide2 main menu. The tutorial can be found in the Tutorial 23 Back Analysis Material Properties.slmd data file. Probabilistic analysis can be used for back analysis of multiple variables. Sensitivity analysis can be used for back analysis of individual variables. Back analysis can be used to determine material strength at slope failure, or the required material strength to achieve a given safety factor.
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This tutorial will demonstrate how to perform back analysis of material properties using sensitivity analysis or probabilistic analysis features in Slide2. Damage Regions (Generalized Hoek-Brown)īack Analysis of Material Properties 1.Analysis of Embankment using multi-modal optimization (MMO).Probabilistic analysis with random shear strength (COV).FOS for Geosynthetic Reinforced Retaining Wall.
Statistical Correlation of Material Properties.Transient Groundwater + Slope Stability.
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