1. Ph.D. Candidate, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing 210098, China.
2. Professor, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing 210098, China.
3. Civil Engineering School, Henan Univ. of Technology, Zhengzhou 450001, China (corresponding author).
4. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing 210098, China.