1. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2. National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
3. State Key Laboratory of Coal Mine Disaster Prevention and Control, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
4. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China