1. Professor of Civil Engineering and Research Director, Centre for Geomechanics and Railway Engineering, Northfields Ave., Wollongong, NSW 2522, Australia; Program Leader, ARC Centre of Excellence for Geotechnical Science and Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia (corresponding author).
2. Research Associate, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.
3. Lecturer, Centre for Geomechanics and Railway Engineering, Northfields Ave, Wollongong, NSW 2522, Australia; Lecturer, Dept. of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.
4. Manager, Ecoflex International Pty Ltd., P.O. Box 3244, Merewether, NSW 2291, Australia.