Based on Finite Element Analysis, The Main Controlling Factors of Coal Rock Permeability Under True Triaxial Stress Are Analyzed

The COMSOL Multiphysics multi-physical field coupling software is used to explore the seepage of coal rock in the true triaxial stress environment. The simulated working condition is the coal rock with a buried depth of more than 1500 m in ChengZhuang, JinCheng. The basic physical parameters of coal rock, such as elastic modulus, Poisson 's ratio, porosity and density, are obtained by uniaxial compression test and mercury injection test. The parameters are input into numerical simulation software to ensure the real reliability of simulation. At the same time, Darcy 's law is selected to define the seepage field, and the physical field of solid mechanics is added to ensure the construction of true triaxial stress environment. The temperature environment of coal seam is simulated by porous media heat transfer module. The simulation results are consistent with the experimental results.