1. Associate Professor, Nottingham Centre for Geomechanics, Div. of Materials, Mechanics and Structures, Faculty of Engineering, Univ. of Nottingham, University Park, NG7 2RD, UK (corresponding author).
2. Ph.D. Student, Nottingham Transport Engineering Centre, Div. of Infrastructure and Geomatics, Faculty of Engineering, Univ. of Nottingham, University Park, NG7 2RD, UK.
3. Associate Professor, Nottingham Transport Engineering Centre, Div. of Infrastructure and Geomatics, Faculty of Engineering, Univ. of Nottingham, University Park, NG7 2RD, UK.
4. Research Officer, Nottingham Transport Engineering Centre, Div. of Infrastructure and Geomatics, Faculty of Engineering, Univ. of Nottingham, University Park, NG7 2RD, UK.
5. Research Fellow, Nottingham Transport Engineering Centre, Div. of Infrastructure and Geomatics, Faculty of Engineering, Univ. of Nottingham, University Park, NG7 2RD, UK.