1. School of Resources & Environment, Henan Polytechnic University, Jiaozuo 454003, China
2. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong 2500, New South Wales, Australia
3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Province, Henan Polytechnic University, Jiaozuo 454003, China
4. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, China