1. Professor, Institute of Geotechnical and Underground Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, P.R. China.
2. Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, 1 Engineering Dr. 2, Singapore 117576 (corresponding author). ORCID: .
3. Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, 1 Engineering Dr. 2, Singapore 117576.
4. Associate Professor, College of Civil Engineering and Architecture, Hainan Univ., Haikou 570228, P.R. China.