1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
2. College of Transportation Engineering, Nanjing Tech University, Nanjing 210009, China
3. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, China
4. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor 48109, Michigan, USA