1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China
2. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, Henan 454003, China
3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo, Henan 454003, China