1. Ph.D. Candidate, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong 2522, Australia.
2. Senior Lecturer, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong 2522, Australia.
3. Associate Professor, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong 2522, Australia (corresponding author).