1. School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China
2. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, China
3. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, China
4. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, China