1. Chongqing University state key laboratory of coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China
2. Chongqing University school of resources and safety engineering, Chongqing University, Chongqing 400044, China
3. Ningxia Institute of Mineral Geological Survey(Autonomous Region Institute of Mineral Geology), Ningxia, Yinchuan City 750000, China