1. Lecturer, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing 210098, P. R. China; Postdoctoral, School of Earth Sciences and Engineering, Nanjing Univ., Nanjing 210046, P. R. China (corresponding author).
2. Lecturer, School of Transportation, Shandong Univ. of Science and Technology, Qingdao 266590, P. R. China.
3. Lecturer, School of Highway, Chang’an Univ., Xi’an 710064, P. R. China.
4. Ph.D. Candidate, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing 210098, P. R. China; Geotechnical Research Institute, College of Civil and Transportation Engineering, Hohai Univ., Nanjing 210098, P. R. China.
5. Professor, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing 210098, P. R. China; Geotechnical Research Institute, College of Civil and Transportation Engineering, Hohai Univ., Nanjing 210098, P. R. China.