1. Professor, Key Laboratory for Ministry of Education for Geomechanics and Embankment Engineering, College of Civil and Transportation Engineering, Hohai Univ., Xikang Rd., No.1, Nanjing, Jiangsu 210098, P.R. China (corresponding author).
2. Associate Professor, College of Civil and Transportation Engineering, Hohai Univ., Xikang Rd., No.1, Nanjing, Jiangsu 210098, P.R. China.
3. Associate Professor, National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai Univ., Xikang Rd., No.1, Nanjing, Jiangsu 210098, P.R. China.