1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, 34 Hujuguan Rd., Nanjing 210029, China.
2. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, 34 Hujuguan Rd., Nanjing 210029, China; Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dams, Nanjing, China.