1. School of Safety Engineering, China University of Mining & Technology, Xuzhou, China
2. Ministry of Education, Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Xuzhou, China
3. State Key Laboratory of Coal Mine Safety Technology, China Coal Technology &Engineering Group Shenyang Research Institute, Shenfu Demon-stration Zone, Xuzhou, China
4. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, China