ABSTRACT
This paper presents some geotechnical aspects of design and construction of a seawall for a sea-front development on the south coast of Peng Chau in Hong Kong. The seawall was built on a very soft to soft marine clay foundation. To meet site stability requirements the seawall was designed and constructed using a staged construction procedure to maintain adequate factors of safety. Vertical band drains were installed to allow an increase in construction rate and to shorten the consolidation period of the clay deposits. The site was preloaded to minimize future ground settlement. The performance of the staged construction, particularly the results of the monitoring for the vertical and horizontal ground movements, is discussed and compared with the analytical predictions. A good agreement between the predicted and actual movement is observed.
