1. Key Laboratory of Coal Methane and Fire Control, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China
2. State Key Laboratory of Coal Resources and Safety Mining, Xuzhou Jiangsu 221116, China
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
4. Department of Mining Engineering and Metallurgical Engineering, Western Australian School of Mines, Curtin University, Kalgoorlie, Australia