1. College of Mining and Safety engineering, Shandong University of Science and Technology, Shandong 266590, China
2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
3. Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing 101601, China
4. Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia