The discontinuity and hardness variation in the reinforced soil, makes modeling difficult, so use of simple methods that are developed to estimate the heterogeneous field behavior has been found. In this paper, an equivalent continuum constitutive model for three-dimensional analysis reinforced soil in FLAC3D, was developed. The soil characteristics of deformation and strength are considered containing up two sets of reinforcements with arbitrary spatial setting and equivalent stiffness tensor of soil are conducted based on superposition of all components. By new constitutive relationships, anisotropy of reinforced soil can be implemented; however plastic strains can develop in pure soil mass. The model C++ code is written and implemented in FLAC3D and used for modeling of a triaxial compressive test on a soil specimen with one set of reinforcement. The stiffness values calculated by the model are compared with the results from an analytical solution. The results derived are in good agreement with those obtained from analytical method.

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