NUMERICAL SIMULATION OF JOINTED ROCK MASS CONSTITUTIVE MODEL AND ITS VALIDATION

To analyze the failure mechanism of the jointed and fractured rock mass, the Burgers creep model of rock with holes has been built by discrete element program (Particle Flow Code). In which Mohr-Coulomb Failure Criterion and Particle contact constitutive relationship are employed. The unification of stress-strain curves obtained by numerical simulations and test results has been used to select micro-level mechanical parameters of PFC, and these selected mechanical parameters are used to model numerically the failure process of the jointed rock mass with holes. Macro-level deformation, damage and failure process of rock samples with different particle unit parameters are achieved. At the same time, the feasibility of the Burgers Model for rock samples in the damage field of rock mass is verified. Finally, using the developed model, the failure mechanism of the jointed rock mass with holes under loading conditions is discussed. The failure mechanism can be reasonably applied to the prediction of failure modes in actual engineering practices and the stability evaluation of the rock mass engineering.