1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, China
2. Key Laboratory of Gas Geology and Gas Control, Jiaozuo, Henan, China
3. The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo, Henan, China
4. School of Mathematics and Information Science, Henan Polytechnic University, Jiaozuo, China