1. Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Hunan Univ., Changsha 40010, China (corresponding author).
2. Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China.
3. Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Hunan Univ., Changsha 40010, China.
4. Associate Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Hunan Univ., Changsha 40010, China.
5. Associate Professor, Dept. of Civil Engineering, Southeast Univ., Nanjing 211189, China.