A Review of Three-Dimensional Slope Stability Analyses based on Limit Equilibrium Method

The stability of slopes is a major concern in the field of geotechnical engineering. Usually two-dimensional analyses based on limit equilibrium method are implemented in this field due to their simplicity and effectiveness. Since these methods ignored the features of the third dimension of slopes, three-dimensional analyses have developed to remove this shortcoming. However, some limitations still exist in the application of three-dimensional methods. Most of these methods assume a plane of symmetry for the slope. Moreover, the internal forces of sliding mass are largely simplified or ignored in the equations of factor of safety. In addition, the shape of slip is usually simplified or limited by these methods. The mentioned limitations restrict the applications of three-dimensional methods in practice. The present paper made a critical review on the applications and limitations of existing three-dimensional slope stability analyses based on limit equilibrium method.