1. Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan, Anhui 232001, China
2. School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China
3. School of Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China