Nonlocal finite element simulation method for fluid-induced rock damage propagation

Abstract

In this paper, the equivalent strain is nonlocalized. The permeability is coupled through the damage variable into the Hydro-Mechanical coupling equation. So as to establish the fluid-driven nonlocal damage expansion model. It is used to solve the localization response problem of quasi-brittle material fracture failure finite element simulation process. So that it can effectively calculate the crack propagation process of rock mass under high pressure fluid. In view of this model, this paper first simulates and compares the experimental results of ‘L’ brittle material plate, and verifies the sensitivity of finite element mesh. Then, through the simulation of the influence of perforation angle on fracture propagation trajectory, the effectiveness of this model for Hydro-Mechanical coupling damage propagation is studied. The results show that the simulation results of the model are consistent with the experiment. It can significantly reduce the grid sensitivity difference caused by localization.