Fracture Simulation of Jointed Rock Mass Using Discrete Element Method

摘要

In this paper, based on basic thought of discrete element method, a 2D generation algorithm of irregular particle generation and particle contact interface generation was adopted. Particle contact constitutive model is induced. Started from microscopic structure of jointed rock mass, microscopic particles parameters, and macroscopic mechanical of rock mass parameters are unified. The damage numerical model of jointed rock mass is established by the microscopic realization of rock material damage from the bonding strength degradation of particles. After its feasibility is proved, by sandstone uniaxial compression experiment, the damage numerical model is applied in Eastern Qinling tunnel collapse. It is found that the model can reproduce the features of rock mass behavior. Moreover, it is useful for the prevention of future tunnel collapse accident.