1. State Key Laboratory of Ming Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, China
2. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, China
3. Transportation and Sales Office, Huaibei Mining Co., Ltd, Huaibei, China
4. Wanglou Coal Mine, Shandong Energy Linyi Group, Shandong, China