1. Lecturer, Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Dept. of Geotechnical Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, People’s Republic of China (corresponding author).
2. Ph.D. Student, School of Civil and Environmental Engineering, Georgia Institute of Technology, 210 Technology Cir., Savannah, GA 31407.
3. Professor, Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Dept. of Geotechnical Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, People’s Republic of China.