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This paper deals with the experimental results of a large scale pullout tests performed in order to study the pullout behaviour, under cyclic and post-cyclic conditions, of different extruded geogrids embedded in a uniform medium sand compacted to 95% of γdmax. The pullout tests were carried out on two high-density polyethylene (HDPE) extruded mono-oriented geogrids of different geometry and confined longitudinal stiffness. A large-scale multi-function pullout test device, capable to apply both the static and cyclic pullout loading, was used. The experimental results highlight the effect of reinforcement geometry and confined tensile stiffness on the post-cyclic pullout resistance. The experimental results presented in this paper have shown clearly the influence of reinforcement geometry and confined tensile stiffness on post-cyclic pullout resistance. Particularly, in the absence of interference phenomena, it is possible to note, both under static and multistage pullout conditions, increases of the pullout resistance mobilized at soil-geosynthetic interface in according to the increases of the surfaces on which the passive and the frictional interaction mechanisms can be mobilized. Moreover, the post-cyclic behaviour can be influenced by the geometrical and mechanical properties of geogrid. Geogrids characterized by greater geometrical characteristics (in terms of bearing and frictional surfaces) and therefore by higher confined longitudinal (tensile) stiffness show post-cyclic pullout resistance almost equal to the one obtained in the corresponding static pullout test.