Wick drain application for one dimensional consolidation, Gulf Harbour Marine Village, Whangaparaoa

During the summer of 1994/95, approximately 80,000 metres of geosynthetic wick drains (Colbond® EX1000) were installed at the Gulf Harbour Marine Village, Whangaparaoa. This was undertaken to accelerate the consolidation settlement of large areas containing up to 9 metres depth of soft to very soft estuarine and alluvial deposits overlying sandstone/siltstone bedrock at depth. This paper outlines the site geology and geotechnical considerations of the project, together with assessing predicted versus actual performance.