Dynamic shear modulus and damping ratio are two important soil dynamic parameters.They are indispensable basic data for seismic response analysis of important projects.375 cohesive soil samples in Jiangsu area including clay

mucky soil

silty clay

silt

and fine sand interbedded strata are presented in the paper.Considering the effect of soil type and embedment depth

the relationship between the maximum shear modulus and embedment depth and the relationships of dynamic shear modulus ratio and damping ratio with shear strain in different embedment depth of each kind of soil are analyzed in detail.The result shows that the maximum shear modulus of each kind of soil increases with the increase of embedment depth.They follow the exponential function.The effect of embedment depth on the relationships of dynamic shear modulus ratio and damping ratio with shear strain of cohesive soil is obvious and the degree of influence decreases with the increase of embedment depth.The fitting formulas for the relationship between maximum shear modulus and embedment depth and the fitting parameters for the relationships of dynamic shear modulus ratio and damping ratio with shear strain in different depth interval of each kind of soil are also given

which provide a reference for practical projects.