The multi-phase model for the simulation of reinforced soils is developed by considering the non-linear elastoplastic behaviour of the soil. In this method, it is assumed that the medium consists of both the soil and the reinforcement, with the reinforcements placed horizontally among the soil medium. These two phases are connected with each other through a perfect bonding interface. The soil constitutive model is defined as non-linear as a function of stress level considering the distance from the current stress state to the ultimate value as well as the soil stiffness, while the reinforcement as a linear element has an elastic-perfectly plastic behaviour. The formulation of a reinforced soil composite in triaxial compression space will be explained herein and the results of a parametric study of the effects of the reinforced characteristics (stiffness and strength) on the behaviour of reinforced soil are presented. Qualitative comparisons between laboratory tests and the simulations indicate good agreement.

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