1. Professor, Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Dept. of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China.
2. Ph.D. Candidate, Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Dept. of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China.
3. Professor, Dept. of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China (corresponding author).
4. Professor, Railway Engineering Research Institute, China Academy of Rails Science, Beijing 100081, China.