1. Associate Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology, Xuzhou, Jiangsu 221116, China (corresponding author).
2. Professor, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou, Jiangsu 221116, China.
3. Assistant Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology, Xuzhou, Jiangsu 221116, China.
4. Graduate Student, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou, Jiangsu 221116, China.