Abstract: Engineering properties of marine soft soils are critical to the costal engineering and construction. Difficulties are frequently encountered in testing the soft soil strength. Due to the sample disturbance, the laboratory tested values usually have low reliability but the insitu testing is difficult to perform under the marine environment. This paper presents the studies on the marine soft soil in a project in Hengqin Island, Zhuhai City. The undrained unconsolidated (UU) triaxial shear test results were compared with the undrained shear strength obtained from vane shear test results at the same depth and the tip resistance from the cone penetration test (CPT) results. Good consistency is obtained from the UU results and vane shear as well as CPT tip resistance. The UU values can be compared with the vane shear test results with a reduction factor.

Key words: UU Test Values, Vane Shear Test Values, CPT Tip Resistance Test Values, Correlation