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The soil stiffness is a resistance force per unit of displacement. This paper provides a comprehensive overview of the stiffness properties of the US Atlantic outer continental shelf fine-grained cohesive sediments for use in wind farm foundation design with applicability in a regional setting. It is in a collaborative series that demonstrates the value of an integrated geoscience approach considering regulatory requirements and project design essentials. The dynamic (small-strain) shear modulus Gmax, shear modulus degradation and damping (G/Gmax and D) curves and static (large-strain) stiffness measures (strain 50 and stiffness ratio (E50/Su) with the rigidity index, Gmax/Su are presented, which are derived specifically from a suite of dynamic and static laboratory test measurements comprising resonant column (RC), bender element (BE), unconsolidated undrained (UU) triaxial, direct simple shear (CK0U-DSS) and K0-consolidated triaxial as well as in situ cone penetration test (CPT) and field P-S logging. Comparison of the relevant site specific stiffness properties with published literature data is also discussed.
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Long et al. (2024) studied this question.
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