Characteristics of Singapore Marine Clay at Changi

Abstract

Singapore marine clay at Changi is a quartenary deposit that lies within valleys cut in the Old Alluvium. It is locally known as Kallang formation. The pre-reclamation site characterization and laboratory testing was carried out by conducting marine sampling boreholes, in situ dissipation tests and field vane test. In situ dissipation tests were conducted with the piezocone, flat dilatometer, self-boring pressuremeter and BAT permeameter. The purpose of the site characterization was to determine the consolidation characteristics, strength characteristics, stratigraphy, and mineralogy of Singapore marine clay. The consolidation properties of marine clay are required prior to land reclamation activities in order to predict the magnitude and rates of settlement with the expected fill load and future service load as well as for the design of soil improvement works. The shear strength properties are required for slope stability analyses during reclamation and for the stability analyses of shore protection works. Clay mineralogy tests and photographic identification of the marine clay was carried out to determine the mineralogical properties and to visually record the marine clay colour and texture.