1. College of Safety Science and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China
2. School of Safety Engineering, Ningbo University of Technology, Ningbo, Zhejiang 315211, China
3. Emergency Research Institute, China Coal Research Institute CCRI, Beijing 100013, China
4. Institute of Mining and Coal, Inner Mongolia University of Science & Technology, Baotou Inner Mongolia 014010, China