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Within the framework of the Dutch SBW project “Strength and Loads on Dikes” extensive soil investigations, analysis, numerical simulation and stability calculations have been performed. The aim of the project is to investigate the design method for a dike slope failure in a high water situation. Various locations in The Netherlands have been selected where the stability is critical. The authors are involved in a project concerning the Northern dike of the river Lek, east of Rotterdam.
One of the unique aspects of this project is that different tests have been performed on one same set of samples for two main soil types, for example Classification tests, Constant Rate of Strain tests, Oedometer tests, Anisotropic Consolidated Undrained Triaxial tests and Direct Simple Shear tests. The main soil types are Holland peat (11 kN/m3) and Tiel Clay (16 kN/m3). Both layers are Holocene deposits, very compressible, organic and anisotropic.
The strength and stiffness parameters have been derived from the laboratory tests. In addition, the advanced model parameters have been adjusted by numerical simulation of the soil tests. Two sets of strength parameters are finally used in a stability analyses of the river dike, both for drained as undrained conditions.
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