The Numerical Test for Pore-Water Pressure and Poisson's Ratio Affecting Rock Core Discing

The paper combines Mohr-coulomb criterion with tension strength criterion and constructs a 3D numerical simulation method of safety degree of potential destroy surface of rock core. Simulating the rock core according to laboratory test conditions using the method, the results of them are consistent. Studied the safety degree of potential destroy surface of rock core with different pore stress and Poisson ratio. The results showed that tensile destroy started from the center and shear destroy started from the fringe of rock core, the increasing of pore water pressure inducing the decreasing of shear safety degree and tensile destroy degree of potential destroy surface. Poisson ratio also inducing the change of safety degree of potential destroy surface, along with the increasing of Poisson ratio, the safety degree of potential destroy surface is also increase and the rock core discing is difficult to be occurred.