This twenty-fifth manual in the GEO5 engineering series focuses on the assessment of slope stability using the Finite Element Method (FEM). The manual guides users through the process of evaluating the factor of safety for a slope, first without additional loading and then under the influence of a strip surcharge. It also covers the stabilization of the slope using pre-stressed anchors. Available for download, this manual is a vital resource for geotechnical engineers involved in the analysis and stabilization of slopes.

Learning Objective:

The goal of this manual is to teach users how to assess slope stability using the FEM program in GEO5. Users will learn how to model slopes, analyze stability under various loading conditions, and apply slope stabilization techniques using anchors. The manual also covers the interpretation of results to ensure that the slope meets the required safety standards.

Assignment Description:

In this assignment, users are tasked with determining the slope stability degree (factor of safety) for a slope under two conditions: without a strip surcharge and with a strip surcharge of 35.0 kN/m². The analysis includes modeling the slope geometry, assigning soil parameters, and performing stability assessments at each construction stage. Additionally, users will stabilize the slope using pre-stressed anchors and reassess the stability. The manual provides step-by-step instructions for setting up the analysis, refining the finite element mesh, and interpreting the results for potential slip surfaces.

Outcome:

Upon completing this assignment, users will be able to accurately assess the stability of slopes using GEO5 FEM software. They will gain practical experience in analyzing slopes under different loading conditions, applying stabilization methods, and using non-linear material models to predict potential failure surfaces. The results will help ensure that the slope design meets the necessary safety factors.

Conclusions:

The manual concludes that using a finer finite element mesh increases the accuracy of the slope stability analysis, though it also lengthens the analysis time. Non-linear material models are essential for capturing plastic strain development and accurately identifying potential slip surfaces. The results from different material models and mesh densities highlight the importance of selecting appropriate analysis settings for reliable slope stability assessment.

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