1. Professor, Key Laboratory of New Technology for Construction of Cities in Mountain Area, State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China.
2. Master’s Candidate, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China.
3. Associate Professor, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China (corresponding author).
4. David Ross Boyd Professor and Aaron Alexander Professor, School of Civil Engineering and Environmental Science, and Alumni Chair Professor of Petroleum and Geological Engineering, Univ. of Oklahoma, 202 W. Boyd St., Rm. 334, Norman, OK 73019.