1. Lecturer, Centre for Geomechanics and Railway Engineering, Faculty of Engineering and Information Sciences, Univ. of Wollongong, NSW 2522, Australia; ARC Centre of Excellence for Geotechnical Science and Engineering, Wollongong City 2522, Australia.
2. Research Director, Distinguished Professor of Civil Engineering, Centre for Geomechanics and Railway Engineering, Faculty of Engineering, Univ. of Wollongong, NSW 2522, Australia; ARC Centre for Excellence for Geotechnical Science and Engineering, Wollongong City 2522, Australia (corresponding author).
3. Associate Professor, Centre for Geomechanics and Railway Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia; ARC Centre for Excellence for Geotechnical Science and Engineering, Australia Faculty of Engineering, Wollongong City 2522, Australia.