Abstract
This paper presents soil properties for foundation design of structures on soft clay subjected to static and combined static and cyclic loads. The foundation design aspects include bearing capacity, cyclic displacements, equivalent soil spring stiffnesses for use in dynamic structural analyses, soil stresses against structures, and settlements due to cyclic loads. The properties include static, post-cyclic static and cyclic shear strengths and deformation properties, pore pressures generated by cyclic loads, and post-cyclic recompression behaviour. It is shown how these properties can be determined from laboratory tests, and the paper presents numerical values of soil properties from triaxial and direct simple shear tests on Drammen clay. Numerical values of other soft soils are also included in some cases. The laboratory tests on Drammen clay aimed at determining soil properties for foundation design of offshore platforms, but the data can be used in foundation design of structures subjected to cyclic loads in general.
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