1. Associate Professor, School of Transportation, Institute of Geotechnical Engineering, Southeast Univ., SiPailou 2#, Xuanwu District, Nanjing 210096, China (corresponding author).
2. Professor, School of Transportation, Southeast Univ., Nanjing 210096, China.
3. Associate Professor, School of Civil Engineering, Central South Univ., Changsha 410075, China.
4. Graduate Student, School of Transportation, Southeast Univ., Nanjing 210096, China.