Progressive Failure Analysis of Accumulation Slope Based on Discrete Element Strength Reduction Method

Abstract

It is difficult to accurately simulate the deformation and failure process of accumulation slope because of its inherent discontinuity, in-homogeneity and aeolotropism properties. Discrete element method (DEM) is adopted in this paper for preliminary study of the deformation and failure process of accumulation slope. Strength reduction method is introduced into the DEM for the study of slope safety factor and the critical slip surfaces; the whole progressive failure process of accumulation slope is also investigated from a microscopic view. Particle friction coefficient and bond strength are set as variables in the process of strength reduction in PFC. Cumulative displacement of slope crest and slope toe and numerical results of particle unbalance force are recognized as a comprehensive index of slope failure. The failure process and safety factor of accumulation slope are obtained by DEM simulation. For comparison, limit equilibrium method (LEM) and finite element method (FEM) are used for the same example. The results show that discrete element strength reduction method outstands in the study of discontinuous medium. The progressive failure mechanism of the accumulation slope is revealed. The safety factor obtained by sole use of DEM is basically the same with that obtained by combined use of FEM and LEM, indicating the safety factor obtained is reliable.