On the interface shear resistance of a novel geogrid with in-plane drainage capability

Author:

Brendan C. O’  Kelly, Patrick J. Naughton  

Journal:

Geotextiles and Geomembranes

Issue Date:

2008

Abstract(summary):

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.

Page:

357-362