Department of Earth and Space Sciences University of Science and Technology 518055;
State Key Laboratory of Coalmine Disaster Dynamics and Control University 400030;
Deep Earth Energy Research Laboratory of Civil Engineering University 3800;
School of Earth and Space Sciences of Science and Technology of China 230026;
School of Electrical Engineering&Information Petroleum University 163318;
Lode angle effect; Hydrostatic stress effect; Strength envelope curve; Porous structure;