1. Professor, School of Civil Engineering, Chongqing Univ., Chongqing 400045, PR China (corresponding author).
2. Ph.D. Student, School of Civil Engineering, Chongqing Univ., Chongqing 400045, PR China.
3. Lecturer, Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan Univ. of Science and Technology, Xiangtan, Hunan 411201, PR China.
4. Graduate Student, China Nuclear Power Engineering Co. Ltd., Shennan St., Shenzhen, Guangdong 518124, PR China.