1. Department of Architecture and Civil Engineering, University of Bath, Bath BA2 7AY, UK
2. School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
3. School of Civil Engineering, Faculty of Engineering and Physical Sciences, University of Leeds, Leeds LS2 9JT, UK
4. School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
5. School of Engineering, Faculty Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK
6. Geotechnical Engineering, High Speed Two (HS2) Ltd, Birmingham B4 6GA, UK