1. Professor, Dept. of Geotechnical Engineering, Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, College of Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China (corresponding author).
2. M.D. Candidate, Dept. of Geotechnical Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.
3. M.D. Graduate, Dept. of Geotechnical Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.