Model Uncertainty in FEM-based Slope Stability Analysis
Date Issued
2012
Date
2012
Author(s)
Lee, Szu-Wei
Abstract
FEM-based strength reduction method is considered to be the most correct way to calculate the factor of safety, the advantages are that satisfy the force equilibrium and moment equilibrium, take into account the deformation factually and do not need to assume the critical slip surface at first.
In this study, we collect references which include 43 numbers of collapsed clay slope examples around the world to simulate the slope model and also minimize the biases in literatures review of different soil parameters. Use FEM-based strength reduction method to analyze the factor of safety in different failure criteria and also compare and discuss with the results of the limit equilibrium metod.
On the other hand, use reliability analysis to establish the transformation relation between the factort of safety calculated by using FEM-based strength reduction method, reliability index and failure probability. Use this transformation relation can be able to analyze the safety of an unknown slope, we hope this can be used as a reference for the remediation of slope.
Use FEM-based strength reduction method to analyze the factor of safety of slope models is a great contribution to stability analysis. Relative to the limit equilibrium method, the finite element method satisfies not only force but also moment equilibrium and considers Young''s modulus, this method is better than others.
In the future, we hope that can consider the spatial variability of soil parameters in the slope model. Moreover, simulate the external force factors like rainfall, earthquakes, etc. to make this analytical model more complete.
Subjects
finite element method
strength reduction method
failure criteria
reliability analysis
limit equilibrium method
reliability index
Type
thesis
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