1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology, Xuzhou 221116, Jiangsu, China.
2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology, Xuzhou 221116, Jiangsu, China (corresponding author).
3. College of Geology and Environment, Xi’an Univ. of Science and Technology, Xian 710054, Shanxi, China.