1. Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu221116, China
2. National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou, Jiangsu221116, China
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu221116, China
4. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu221116, China
5. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu221116, China