DeltaSand: A state dependent double hardening elasto-plastic model for sand: Formulation and validation

Numerical simulations of pile installation in sands require advanced constitutive models which are able to predict the mechanical behaviour of soils in a wide range of soil stresses under different loading conditions such as cyclic and monotonic loadings. In this paper, an elasto-plastic constitutive model within a double hardening framework is described which is capable of reproducing the mechanical behaviour of sands in different soil states (stress and relative density) under deviatoric and volumetric loadings. First, the formulation of the model is described and then the capability of the model is shown by simulating laboratory tests data of Karlsruhe sand for various relative densities, stress states and loading conditions.