1. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
2. Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China
3. Jiaozuo Coal Company, Henan Energy and Chemical Group Corporation, Jiaozuo 266590, China
4. Tengdong Coal Company, Zaozhuang Mining Group Corporation, Zaozhuang 277519, China