1. Postdoctoral Researcher, School of Civil Engineering, Central South Univ., Changsha 410075, China (corresponding author).
2. Professor, School of Civil Engineering, Central South Univ., Changsha 410075, China.
3. Professor, Geotechnical Institute, Technical Univ. Bergakademie Freiberg, Freiberg 09599, Germany.
4. Associate Professor, School of Civil Engineering, Central South Univ., Changsha 410075, China.