In the paper

by analyzing the results of free vibration column apparatus test on recently deposited soils of floodplain including clay

silty clay

mucky silty clay

Silty clay and fine sand interbedded strata

silt and fine sand in Nanjing and its neighboring areas. The effect of confining pressure

shear strain and soil structure property on dynamic shear modulus G and damping ratio λ was investigated in detail. Comparing with the variation range of G/G

max

～γ and λ～γ curves of sand recommended by Seed

&

Idriss

the test results show that the silty clay and fine sand interbedded strata should not be simply treated as sandy soil or silty clay. Furthermore

based on the test results and theoretical analysis

the averaging curves

recommended values and envelopes of dynamic shear modulus ratio G/G

max

and damping ratio λ versus dynam

ic strain γ for recently deposited soils in Nanjing and its neighboring areas are presented. However

the proposed values can only be used for reference for actual engineering projects.