Laminated soil distributes widely in the sea around China. Due to its special fabric

its physico-mechanical properties are different from the normal soil which will affect prediction of pile driving

spudcan penetration. In this paper

field piezocone penetration test(CPTU) and laboratory test methods are used to analyze the physico-mechanical properties of laminated soil in South China Sea; and the shear strength of laminated soil is discussed. The test results show that the physico-mechanical properties of laminated soil are different from normal sand’s or clay’s ones. Since the sand lamination presence

the undrained shear strength of laminated soil getting from UU tests is conservative; and it is the lower limit of that got from CPTU. The results of CPTU could show the special characteristics of laminated soil more clearly. The change scale of friction ratio of laminated soil got from CPTU is from 0 to 8 which is much larger than that of normal sand and clay. The relationship between friction ratio and corrected cone resistance could be simulated with hyperbola approximately. The special characteristics of laminated soil should be considered when the undrained shear strength is determined in static analysis properly.