1. Distinguished Professor, Dept. of Geotechnical Engineering and State Key Laboratory Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).
2. M.Sc. Student, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China.
3. Lecturer, Dept of Civil and Environmental Engineering, Univ. of Surrey, Guildford, Surrey, GU2 7XH, U.K.
4. Ph.D. Student, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China.