ABSTRACT
A site investigation was carried out at a 10 year old man-made island which was reclaimed using dredged clay lumps and sea-sand to ascertain present state, strength and deformation characteristics. The investigation included the use of Radioisotope (RI) cone to measure water content and density, cone penetration test (CPT) to determine strength, and boreholes to obtain disturbed and undisturbed soil samples. Firstly, the in-situ performance of RI cone in investigating the state of reclaimed land is discussed. The in-situ natural water content and the wet density profiles measured with RI cones are compared with data directly obtained from laboratory tests on samples collected from boreholes. Secondly, in-situ shear strength of reclaimed clay measured using CPT and triaxial strength from undisturbed samples are compared. Finally, the present state of the dredged clay lumps is also discussed.
