1. Assistant Professor, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam, Hong Kong (corresponding author). E-mail: cycheuk@hkucc.hku.hk
2. Senior Lecturer, Centre for Offshore Foundation Systems, Univ. of Western Australia, Crawley, Australia.
3. Professor of Soil Mechanics, Dept. of Engineering, Univ. of Cambridge, Cambridge, UK.