1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
3. Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou, Jiangsu 221116, China