Abstract
The enhancement in the short-term interface shear strength (critical case for embankment construction) achieved by a novel geogrid that combines both reinforcement and in-plane drainage functions was studied. Marginal fill (wet gravely clay) was standard Proctor compacted to 92% of its maximum dry density and tested under consolidated-undrained conditions in the large shearbox apparatus. The interface shear resistance ( τ s−g) values mobilized for the novel geogrid were similar to the undrained shear strength of the surrounding soil. In contrast, the τ s−g values mobilized for a conventional geogrid, which had similar physical and tensile strength properties, were only between 82% and 85% of the undrained shear strength of the soil. Overall, the undrained shear resistance mobilized along the soil–geogrid interface was between 20% and 30% greater for the novel geogrid than for the conventional geogrid.
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