Abstract: The parameters of the Quaternary marine originated cohesive soil have the characteristics of random spatial distribution and variability, so it is important to obtain the accurate strength parameters in geotechnical investigations. As one of the most widely used insitu methods, cone penetration test (CPT) has obvious advantages in determining the undrained shear strength of quaternary coastal cohesive soils. Based on the geotechnical engineering investigation of Binhai Port Industrial Park, Binhai County, Yancheng City, this paper uses regression analysis to establish the correlation between the undrained shear strength obtained by CPT and different laboratory tests. The research results show that the undrained shear strength of cohesive soil increases linearly with net cone resistance, and different theoretical cone coefficients are adopted. The theoretical cone coefficient range is between 13.25 and 22.93.

Key words: Cone Penetration Tests, Quaternary Cohesive Soils, Marine Originated, Undrained Shear Strength, Geotechnical Investigation