Constitutive relations for granular soils and interfaces are proposed. In order to consider more than tenth of cycles of loadings with a unique set of parameters, the model takes into account the evolution of the soil internal structure including density, fabric but also the mean pressure. Actual experiments involving Fontainebleau sand are simulated with the constitutive models: laboratory tests involving soils and rough interfaces and the loading of a pile in a sand mass. Triaxial tests for different densities and different confining pressures validate the predictive abilities of the constitutive model for the soil volume element. The relevance of the interface constitutive model is also tested with some interface shear tests. The simulation of the boundary value problem finally gives quite satisfactorily values for the pile settlement after dozens of compressive cycles.
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