A method of Slope Stability Analysis by FEM

On a slope stability analysis as an optimal design process (1)

Abstract

The analysis of slope stability under complex conditions occurring in practical problems such as inhomogeneity of soils, degeneration of composing materials, and changes in loading conditions must be carried out based on the realistic stress distribution in slopes. In addition, the analysis of slope stability seen from the viewpoint of the design process must be performed in the following two procedural phases
1. Determine the minimum F. S at the section in question.
2. Search and confirm a value of the design variable to make the minimum F. S optimal.
It is shown in this research that the use of sensitivity derived by FEM analysis as a linear extrapolated predictor of possible variation of the safety factor represents a useful and consistent method of stability analysis of slopes containing the above two phases.
The safety of the slope against slip is expressed here as
_??_
The sensitivity of F. S S_f =∂F_s/∂x_e is also derived.
The handling of the first of the above phases is discussed in part 1.