1. Winthrop Professor of Geotechnical Engineering, School of Civil Engineering, Univ. of Western Australia, Perth, WA 6009, Australia (corresponding author).
2. Lecturer, Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong Univ., Chengdu 066004, China; formerly, Academic Visitor, School of Civil Engineering, Univ. of Western Australia, Perth, WA 6009, Australia.
3. Engineer, SRK Consulting, 10 Richardson St., Perth WA 6005, Australia; formerly, Undergraduate Student, School of Civil Engineering, Univ. of Western Australia, Perth, WA 6009, Australia.