1. Associate Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, PR China (corresponding author).
2. Master’s Candidate, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, PR China.
3. Lecturer, Audit Dept., China Univ. of Mining and Technology, Xuzhou 221116, PR China.