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首页> 外文期刊>Journal of geotechnical and geoenvironmental engineering >Behavior of Geogrid-Sand Interface in Direct Shear Mode
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Behavior of Geogrid-Sand Interface in Direct Shear Mode

机译：直剪模式下土工格栅界面的行为

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摘要

The contribution of transverse ribs to the soil-geogrids interaction under pullout mode has been well documented. However, the contribution of transverse ribs to the soil-geogrid interaction under direct shear mode is, at best, unclear. Consequently, this paper presents the results of a comprehensive direct shear testing program aimed at evaluating the contribution of transverse ribs to the interface shear. The direct shear tests involved Ottawa sand and several polyester geogrids with a variety of material tensile strength, percent open area, and aperture pattern. The test results show that the shear strength of sand-geogrid interfaces under direct shear mode is significantly higher than that of sand-geotextile interfaces. Analysis of shear displacement-strength response of the interfaces indicates that, in addition to interface shear components due to sand-rib friction and sand-sand shear at the location of the openings, the transverse ribs provide additional contribution to the overall sand-geogrid interface resistance. Specifically, analysis of the results reveals that the transverse ribs of the geogrid used in this study provide approximately 10% of interface shear resistance. This contribution is positively correlated with the tensile strength and the stiffness of geogrid ribs, but is negatively correlated with the percent open area of the geogrid. A simple model is proposed to quantify the contribution of transverse ribs to the interface shear strength under direct shear mode.
机译：在拔出模式下，横肋对土壤-土生动物相互作用的贡献已得到充分证明。但是，在直接剪切模式下，横向肋骨对土壤-土工格栅相互作用的贡献至多还不清楚。因此，本文介绍了旨在评估横向肋对界面剪切的影响的综合直接剪切测试程序的结果。直接剪切测试涉及渥太华砂和几种聚酯土工格栅，这些土工格栅具有各种材料的抗张强度，开口率百分比和孔径模式。试验结果表明，在直接剪切模式下，砂土-土工格栅界面的抗剪强度明显高于砂土-土工织物界面。界面的剪切位移-强度响应分析表明，除了由于开孔位置处的肋肋摩擦和砂-沙剪切引起的界面剪切分量外，横向肋对整个砂土-地质网格界面也有贡献。抵抗性。具体而言，对结果的分析表明，本研究中使用的土工格栅的横向肋提供了约10％的界面抗剪强度。该贡献与土工格栅肋的抗拉强度和刚度成正相关，但与土工格栅的开孔百分比成负相关。提出了一个简单的模型来量化在直接剪切模式下横向肋对界面剪切强度的贡献。

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