1. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, China
2. National Professional Laboratory for Fundamental Research of Mine Gas and Dust Control Technology, School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China
4. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu, China