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The recent introduction of geogrids with triangular apertures have raised questions regarding properties of these geogrids along various directions. This study presents the results of an experimental program conducted to determine soil-geosynthetic interaction properties in various directions of triangular and biaxial geogrids. Specifically, small-scale soil-geosynthetic interaction tests were conducted using a triangular geogrid and a biaxial geogrid and a uniform gravel backfill subjected to a normal pressure of 21 kPa. The geosynthetic specimens were cut in five directions including the machine and cross-machine directions, and at orientations of 30, 45, and 60 degrees between the machine and cross-machine directions. Ultimate pullout strength and the stiffness of the soil-geosynthetic composite (KSGC) were obtained by using the soil-geosynthetic composite (SGC) model. Overall, it was found that the soil-geosynthetic interaction properties, including ultimate pullout resistance and KSGC, were more uniform in the triangular aperture geogrid than the biaxial geogrid. Prediction by the SGC model also confirmed the above finding.
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