Determination Method of Critical Slip Surface Based on PSO Algorithm

It is an important method for slope stability analysis by using the numerical results of limit equilibrium analysis,and how to determine the location of the most dangerous slip surface is the key for the slope stability analysis.This paper introduces a method,which controls the endpoints of slip surface by using particle swarm optimization theory,and controls the surface radius by equipartition approximation method.The method can be used to search the potential slip surface inside a slope and to calculate the safety factor of slip surface,and then the minimum safety factor of the slope and the most dangerous potential slip surface position are determined.Using a landslide of Kunming highway as an example for analysis,comparing the most dangerous sliding surface search with field survey results,the results show that the calculation result is consistent with the practical engineering.Therefore,the validity of this method is confirmed.