1. Key Laboratory of Mine Geological Hazards Mechanism and Control, Xi’an 710054, China
2. Shenhua Geological & Exploration Company Ltd., China Energy Group, Beijing 102211, China
3. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
4. Key Laboratory of Ground Fissures Geological Hazards (Jiangsu Research Institute of Geological Survey), Nanjing 210049, China