1. Ph.D. Candidate, School of Transportation, Southeast Univ., Nanjing 211189, China; Visiting Ph.D. Student, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore 639798.
2. Professor, Institute of Geotechnical Engineering, School of Transportation, Southeast Univ., No. 2, Southeast Rd., Jiangning District, Nanjing 211189, China (corresponding author).
3. Ph.D. Candidate, Institute of Geotechnical Engineering, School of Transportation, Southeast Univ., Nanjing 211189, China.