Abstract：It is a very complicated problem to simulate the blasting effects of multi-layer geomaterials. Three- dimensional beam-particle model in the frame of DEM(discrete element method) is used to simulate the blasting effects of multi-layer geomaterials. The media have been discretized by spherical elements；and the elements in contacts are connected by beams. So the media are simplified into compound structure，which is composed of particles and beams. The aggregate of particles had the similar strength to the initial media because of the action of beams. The DEM is employed to simulated movements of particle，and the deformations of beams are calculated by the relative displacements between particles in contact. A strength law of beams is used to verify whether a deformed beam exists or not. The emergence of cracks and formation of fragments can be simulated by removed beams whose deformations meet the strength rule. The matrix-displacement method is used to calculate forces of beams，and the forces of beams are exerted on particles as opposite forces. The results show that the large deformations of geomaterials induced by blast can be simulated well by the particle-beam model than those of finite element method based on the continuous mechanics. The model can realistically reflect the crack generation and extension，and the shivers formation and materials shifting away from matrix. The simulation results are approximately coincident with test results. So，the beam-particle model is a valid method to simulate mechanical behaviors with high loading rate.
