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Monotonic and cyclic properties of silty sand and sandy silt for foundation design of offshore windfarms

This paper presents results of a series of monotonic and cyclic Direct Simple Shear (DSS) laboratory tests performed on reconstituted samples of two silty sands and one sandy silt. The laboratory program aimed to determine the cyclic shear strength and deformation characteristics of soils to be used in the offshore wind turbine foundation design. Various cyclic contour diagrams including cyclic shear strength and average and cyclic shear strains for different number of cycles are provided. The effect of strain rate for drained monotonic tests and Over Consolidation Ratio (OCR) effect on both monotonic and cyclic properties are discussed. This study indicated that the fines content plays an important role in static and cyclic shear strength of silty soils, in addition to mineralogy and coefficient of uniformity.