1. Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou, China
2. College of Safety Engineering, China University of Mining & Technology, Xuzhou, China
3. College of Mining Engineering, North China University of Science and Technology, Tangshan, China
4. Mining Development and Safety Technology Key Laboratory of Hebei Province, North China University of Science and Technology, Tangshan, China