1. College of Mining, Guizhou University, Guiyang, P.R. China
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China
4. Key Laboratory of Karst Georesources and Environment, (Guizhou University) Ministry of Education, Guiyang, China
5. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi, China