Combined finite-discrete element analysis of rock slope stability under dynamic loading

摘要

Rock slope instability phenomena have been often correlated to seismic activity. Therefore, earthquake-induced ground motion should be taken into account when performing slope stability analysis in seismically active areas of the world. In the present study, the combined finite-discrete element (FEM/DEM) numerical method is proposed as a tool to assess stability of rock slopes subjected to seismic shaking. Main advantages of FEM/DEM include the capability of simulating interaction between multiple blocks, rock breakage and fragmentation and evaluating failed block trajectory and run-out distance. Algorithmic developments such as absorbing boundary conditions and rock joint shear strength degradation model were specifically introduced to correctly model stress wave propagation and joint behaviour. Effectiveness of the method was proved by means of two conceptual models relative to a planar failure and a rock fall, respectively.