The permeability variation model with compressionshear damage in coal rock

摘要

The study on the evolution laws of fracture is the effective way to reveal the essence of coal un stable failure from the microscopic views. The coal microscopic damage mechanism is analysed through the microscopic observation . Based on the theories and methods of micromechanics, a macroscopic anisotropic damage constitutive model of coal rock mass is established. The permeability evolution equation is derived in REV based on the seepage theories. Thus the coupled damage-seepage constitutive model is established based on micromechanics. The numerical simulation and experimental study are accomplished to verify the validity of the model.