1. Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).
2. Ph.D. Candidate, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China.
3. Graduate Student, Dept. of Civil Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
4. Professor, Dept. of Civil Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.