1. Professor, School of Civil, Mining and Environmental Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia; and Director, Centre for Geomechanics and Railway Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia; and Program Leader, Australian Research Council Centre of Excellence in Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia (corresponding author).
2. Associate Professor, Bengal Engineering and Science Univ., Howrah, West Bengal 711103, India; formerly, Endeavour Postdoctoral Research Fellow of Australian Government, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia.
3. Senior Lecturer, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia; and Australian Research Council Centre of Excellence in Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia.