1. M.Sc. Student, State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China.
2. Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China (corresponding author).
3. School of Energy and Mining Engineering, China Univ. of Mining and Technology, Beijing 100083, China; Gu-Cheng Coal Mine of Shanxi Lu’an Mining Group, Changzhi, Shanxi 046204, China.
4. Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China.