The formulation of the poroelastoplastic constitutive equatitios at large strains of a fully saturated material is performed focusing on the usually ignored influence of large strain plasticity on the poroelastic properties. A micromechanics approach allows to take into account the evolution of the microstructure geometry which in turn induces a coupling between elasticity and plasticity. Such a coupling results in an additional term in the macroscopic Cauchy stress rate equation that leads to a modified Jaumann derivative. The pressure rate equation is also analyzed. Application to the consolidation phenomenon shews that elasticity-plasticity coupling may lead to significant effects.
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