1. Ph.D. Candidate, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China.
2. Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).
3. Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China.