Abstract
Geogrid, one of the geosynthetics, was usually manufactured in rectangular, square or triangular apertures. In this paper, HDPE geogrids with a new shape of circular aperture was introduced. A series of laboratory pull-out tests were conducted to study on the interface properties of the geogrids. Three kinds of geogrids with different aperture shapes and different effective area ratios were prepared. The pull-out stress- displacement curves of the geogrid were depicted. Moreover, the residual resistance in all the cases was analyzed. Based on the test result, the apparent cohesion and apparent internal friction angle were determined. Furthermore, numerical modeling was conducted to demonstrate the stress distribution of the interface and the displacement of the geogrids. It was suggested that geogrids with higher effective area ratio were confined more strongly by the soil specimen and circular aperture geogrids were confined more strongly too. Circular aperture geogrids with the diameter of 48 mm leaded to the maximum coefficients of residual resistance and contributed relatively high interface parameters. The numerical modeling revealed that circular aperture geogrids leaded to general relative uniform stress distribution. Circular aperture geogrids with the diameter of 48 mm possessed the highest stiffness and enable the largest displacement region to be mobilized. The stable architecture of circular aperture geogrid resulted in the highest frictional resistance.
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Acknowledgments
This study has been supported by the National Natural Science Foundation of China (NSFC) (No. 41372280). The authors would like to express their gratitude for these financial assistances.
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Gu, J., Zhang, M., Dai, Z. (2018). Numerical and Experimental Investigation of Tensile Behavior of Geogrids with Circular and Square Apertures. In: Li, L., Cetin, B., Yang, X. (eds) Proceedings of GeoShanghai 2018 International Conference: Ground Improvement and Geosynthetics. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0122-3_38
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DOI: https://doi.org/10.1007/978-981-13-0122-3_38
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