In order to evaluate the performance of geofoam inclusions, parameters such as wall height, type of retaining wall (yielding and non-yielding types), density and thickness of geofoam inclusion were studied. Two earthquake records were selected for present research: far-field and near-field. Retaining walls at the heights of 6 and 9 m and two types of EPS geofoam, EPS15 (γ = 0.15 kN/m 3) and EPS20 (γ = 0.2 kN/m 3), were modeled at relative thicknesses (t/H) of 0.1 and 0.2. According to the results, the isolation efficiency of geofoam inclusion against the forces imposed to the retaining wall, A P, was achieved in static condition more than dynamic condition. In the present study at seismic record of the near-field, EPS geofoam showed a better performance than the far-field record in reduction of lateral forces. Also, the isolation efficiency of geofoam inclusion against the permanent displacement, A d, and application point of the seismic force to the yielding retaining wall were investigated.
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