Discrete element analysis of jointed rock mass impact on rigid baffle structure

Abstract

Rockslide is a hot topic and universal phenomenon in the mountainous regions prone to geological hazards, which may pose substantial threats to property. The discrete element method (DEM) has been widely used to simulate the movement process of rockslide and avalanche. However, the rockslide involving jointed rock mass needs more adequate study to evaluate the safety implications effectively. In this paper, a series of DEM tests are conducted to study the movement and fragmentation of blocks with varying structure. The results show that at sliding angle of 45°, horizontal velocity reduces more slowly than vertical velocity because the particles move in a forward direction after impacting the bottom wall. The existence of a baffle structure limits sliding particle movement effectively and enhances the arch effect through the distribution of contact force chains. The number of joints, slope angle and sliding distance have considerable impact on bond breaking percentages and the displacement of the rock mass center. All bond break percentages are close to 90%, and number of joints and slope angle have little impact on the displacement of the rock mass center. This study can guide landslide disaster prevention.