1. Professor, State Key Laboratory of Hydrosciences and Engineering and Institute of Geotechnical Engineering, School of Civil Engineering, Tsinghua Univ., Haidian, 100084 Beijing, China (corresponding author).
2. Lecturer, Institute of Geotechnical Engineering, School of Highway Engineering, Chang’An Univ., 710064 Xi’an, China.
3. Engineer, Guangdong Provincial Institute of Water Resources and Hydropower, 510610 Guangzhou, China.