1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing400044, China
2. Key Laboratory of Low-grade Energy Utilization Technology and System, Ministry of Education, College of Energy and Power Engineering, Chongqing University, Chongqing400044, China
3. Chongqing Key Laboratory of Heterogeneous Material Mechanics, College of Aerospace Engineering, Chongqing University, Chongqing400044, China
4. School of Civil Engineering, The University of Queensland, Brisbane, QLD 4072, Australia