1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China
2. Post-doctoral Research Station of Mineral Engineering, Chongqing University, Chongqing, China
3. China Coal Technology Engineering Group, Chongqing Research Institute, Chongqing, China
4. College of Construction Engineering, Jilin University, Changchun, China