1. Ph.D. Student, Institute of Geotechnical Engineering, Southeast Univ., Nanjing 210096, China; presently, Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2 (corresponding author).
2. Graduate Student, Institute of Geotechnical Engineering, Southeast Univ., Nanjing 210096, China.
3. Professor, Institute of Geotechnical Engineering, Southeast Univ., Nanjing 210096, China.