Research of the Numerical Simulation Based on Granular Discrete Element Method of Rocky Slopes with Weak Interlayer’s Under Seismic Loads

Based on the water conservancy and hydropower projects of the red rock barrier lake in Ludian County, Yunnan Province, this paper describes the simulation of a B1 rock slope model using the discrete element to test the earthquake damage process, the fracture extension process and the stability of rock slopes. This paper also introduced the modeling process, calibration sequence of a micro structure parameter, the determination of uniaxial-biaxial loading rate of numerical tests and seismic loading method. In order to evaluate the stability of slope under nature and seismic state, the convergence of the time-displacement history curve is regarded as the standard of whether the slope is stable. The results of the trial indicated that earthquakes affect the initiation, acceleration, and progression of rock slope failures. The destruction of rock slopes was mainly attributed to tension and shear, so the parameters of shear strength of slope rock mass materials determined the stability of the deformation. Given the stress concentration along the weak rock stratum, a fracture easily formed and expanded into the plastic penetration area from the top surface of the rock slope.