1. Research Assistant, Institute of Geotechnical and Underground Engineering, Beijing Univ. of Technology, Beijing 100124, China; Postdoctoral Researcher, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, China.
2. Professor, Institute of Geotechnical and Underground Engineering, Beijing Univ. of Technology, Beijing 100124, China (corresponding author).
3. Research Assistant, College of Architectural Engineering, Inner Mongolia Technical College of Construction, Hohhot 010070, China.
4. Ph.D. Candidate, Institute of Geotechnical and Underground Engineering, Beijing Univ. of Technology, Beijing 100124, China.
5. Professor, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, China.
6. Professor, Institute of Geotechnical and Underground Engineering, Beijing Univ. of Technology, Beijing 100124, China.