1. Geotechnical Engineer, Ground Engineering Practice, WS Atkins plc, Bristol BS32 4RZ, U.K.; Univ. of Bristol, Univ. of Bristol, Dept. of Civil Engineering, Bristol BS8 1TR, U.K. (corresponding author). ORCID: .
2. Senior Lecturer in Structural Engineering, Dept. of Civil Engineering, Univ. of Bristol, Bristol BS8 1TR, U.K.
3. Reader in Geomechanics, Dept. of Civil Engineering, Univ. of Bristol, Bristol BS8 1TR, U.K.
4. Reader in Civil Engineering, School of Science and Engineering, Univ. of Dundee, Dundee DD1 4HN, U.K.