1. Ph.D. Student, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, South Australia 5005, Australia.
2. Lecturer, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, South Australia 5005, Australia (corresponding author).
3. Emeritus Professor, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, South Australia 5005, Australia.
4. Senior Lecturer, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, South Australia 5005, Australia.