Numerical Analysis of Failure Process of Intermittent Single Jointed Rock Mass Based on Potential Energy Dissipating Principle

Abstract

A rock material biaxial compression test simulation based on the contact constitutive model for brittle rocks is built in this paper by the aid of particle flow code in two dimensions, which is on the basis of parameter sensitivity analysis and analysis by inversion to get the microscopic model parameters. Furthermore, a rock sample with intermittent single joint containing different angle is established on the basis of adaptability, which analyzed new crack initiation in the process of rock in compression, extension, damage and the crack under different joint angle to carry out the whole process, crack number change process by combining the energy dissipation mechanism. It is shown that the extension process of jointed rock mass is essentially driven by energy release of dynamic instability phenomenon caused by the energy dissipation. The destruction form, peak stress and crack number of jointed rock mass are related to joint angle which shows the overall performance: lager the joint angle is, the greater the peak stress of rock mass damage will be, the more the number of rock's crack will be. Keywords-rock material biaxial compression test; particle flow code in two dimensions; crack initiation; crack number