Based on the discrete element method DEM

this article constructs the constitutive model of particles connected damage.Three dimensional steep rock model is built to simulate the rock progressive failure evolution process.This paper selects nine test points and analyzes the parameter variation from stable state to slide

and then the evolution of gravel movement.The results show that the meso-particles from the adhesion to the fracture and then to the movement

nonlinear motion characteristics are differentiated obviously.Under horizontal earthquake

the left side of rock shows progressive destruction

that is fracture-separation-contact collision and then separate motion.Under different seismic intensities

there are obvious differences in rock damage.For 15.0or more seismic amplitude

the rock is severely damaged.Results show that if there is P-wave input only

the rock is cracked

the central portion suffers larger deformation

but the overall structure remains intact.Seismic shear wave is the main factor of rock damage.Under the superposition of the longitudinal waves and transverse waves on both sides

the damage is serious.