Limit Equilibrium Method and Finite Element Method for Modified Pseudo-static Analysis Comparison

The most used slope stability method for design is the limit equilibrium method. This approach, however, is unable to detect changes in ground behavior or the history of stress. The slope formation process and other ground features can be taken into account in a slope stability study using the finite element approach, although it takes more time to complete the analysis. The advantages of combining slope stability analysis utilizing the finite element approach and the limit equilibrium method have been the subject of extensive investigation. Recently, the Indonesian National Standard (SNI) for earthquake load calculation of embankment dams does not recommend the pseudo-static method. However, it is still accepted with modified pseudo-static analysis. Implementation of the modified pseudo-static analysis method for earthquake loads will be a little difficult if using the finite element method with the strength reduction factor approach. Calculating the modified Pseudo-static earthquake load using the finite element method can be approached with a stress analysis method. This method computes the safety factor for multiple assumed virtual sliding surfaces using the stress results of finite element analysis, and the minimum safety factor and corresponding critical section is computed. This paper discusses the comparison of stability analysis for static loading conditions and loading by modified pseudo-static earthquake conditions utilizing both the finite element method and the limit equilibrium method. The comparing outcomes between these two approaches provide different safety factors that were not significant.