1. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, China
2. National Engineering Research Center for Coal and Gas Control, China University of Mining and Technology, Xuzhou, China
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, China
4. Chongqing Research Institute of China, Chongqing Research Institute of China Coal Technology and Engineering Group Crop, Chongqing, China