Test and DEM investigation on shear behaviour of three-dimensional geogrid–sand interface

Abstract

Interface shear characteristics have an important impact on the stability of geosynthetically reinforced soil structures. The shear characteristics of three-dimensional geogrid–sand interfaces were investigated using large-scale direct shear tests and the discrete element method. Geogrids were manufactured by 3D printing. The effect of a mesh pattern and transverse-rib thickness on the stress–displacement relationship, strength parameters, coordination number, and porosity distribution were evaluated. The results showed that the mesh pattern and transverse-rib thickness have an impact on the interface shear characteristics. The peak and residual interface shear strength of modified geogrid mesh pattern exceeded that of biaxial geogrids. The average coordination numbers of the modified geogrid mesh pattern were greater than those of the biaxial geogrid. The variability of particle compactness, as characterised by the porosity distribution, shows how the modified mesh pattern increases the interface shear strength. The interface shear strength of the geogrid-sand interface was improved by thickening the transverse ribs of the modified geogrid mesh pattern.