1. Postgraduate Student, School of Engineering, Deakin Univ., Pigdons Road, Geelong, VIC 3217, Australia (corresponding author).
2. Professor, Center for Geotechnical and Materials Modeling, Univ. of Newcastle, NSW 2308, Australia.
3. Winthrop Professor, Center for Offshore Foundation Systems, Univ. of Western Australia, WA 6009, Australia.
4. Lecturer, School of Engineering, Deakin Univ., VIC 3217, Australia.