1. Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, China
2. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China
3. Dafosi Coal Mine, Shaanxi Binchang Mining Group Co, Ltd, Xianyang, Shaanxi, China
4. School of Safety Science and Engineering, Anhui University of Science & Technology, Huainan, Anhui, China