1. Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou 221116, China
2. School of Mines, China University of Mining & Technology, Xuzhou 221116, China
3. Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy
4. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, Sichuan University, Chengdu 610065, China