A common way to estimate the dynamic shear modulus for preliminary foundation design and cost purposes is to determine the static shear modulus using limited subsurface data and then to apply a factor to obtain the dynamic modulus. A more accurate approach is proposed for estimating the dynamic shear modulus of cohesive soils using published data relating shear modulus to shear strain, shear strength, and plasticity, supplemented by extensive and so far unpublished results of seismic shear wave velocity tests. A numerical relationship is proposed between dynamic shear modulus (small strain amplitude modulus) and static shear modulus (large strain amplitude modulus) based on strength and index properties of the soil.
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