1. Professor, Dept. of Geotechnical Engineering, Tongji University, Shanghai, P.R. China.
2. Professor, Dept. of Civil Engineering, Hong Kong Univ. Science and Technology, Clear Water Bay Kowloon, Hong Kong.
3. Visiting Research Student, Dept. of Civil Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.