Finite-Element Modeling of Geogrids in Trenches under Inclined Pull

Abstract

Three-dimensional finite-element analyses of the inclined pullout behavior of geogrids embedded in three types of anchors (run-out, I-type, and L-type) are presented in this paper. The soil behavior is represented by the elastic–perfectly plastic Mohr–Coulomb (MC) model and the geogrid behavior with linear-elastic plate elements. The geogrid is modeled using the geometrical and index properties of the geogrid used in model tests. The predicted results from the finite-element analyses are compared with the corresponding model test results. The peak pullout force values for different values of inclinations and types of anchors are predicted with reasonable accuracy by the present numerical model. However, the results show that the post-peak response for run-out and I-type anchors and the stiffness in the case of I-type and L-type anchors are not satisfactorily modeled.