1. State Key Laboratory of Coal Resources and Safety Mining China University of Mining and Technology Xuzhou 221116 China
2. Key Laboratory of Coal Methane and Fire Control, Ministry of Education China University of Mining and Technology Xuzhou 221116 China
3. School of Safety Engineering China University of Mining and Technology Xuzhou 221116 China
4. Department of Mechanical Engineering, Faculty of Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117576 Singapore