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首页> 外文期刊>International journal of geotechnical engineering >Evaluation of sand-geosynthetic interface behavior for earth reinforcement
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Evaluation of sand-geosynthetic interface behavior for earth reinforcement

机译：泥土-土工合成材料界面作用对土工加固的评估

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摘要

For the effective use of a geosynthetic material in earth reinforcement, along with mechanical properties the interaction behavior of geosynthetic with backfill material has significant importance regarding safety analysis. This paper investigated the interface behavior of a new type of geosynthetic, made of Basalt fiber, with sand through a series of direct shear tests. In the tests, the applied normal stresses were varied from 40 to 160 kPa. The test results reveal that the shear strength of all sand-geosynthetic interfaces increased with the increasing normal stresses. The geogrid having small apertures and thin ribs shows the maximum interface shear resistance whereas the sand-geotextile interface shows significantly lower shear resistance comparing to that of sand-sand interface. Strain hardening-softening behavior is clearly observed for the sand-geogrid interfaces, but the geotextile interface shows no softening behavior after the peak. It is also observed that the presence of sand in the apertures of geogrids dominates the dilatancy behavior of the sand-geogrid interfaces. The average interface efficiency of the sand-geogrid interfaces tested in this study is found ranging from 0.61 to 0.87.
机译：为了有效地使用土工合成材料以及机械性能，土工合成材料与回填材料的相互作用行为对安全性分析具有重要意义。本文通过一系列直接剪切试验，研究了一种新型的玄武岩纤维合成材料与沙子的界面行为。在测试中，所施加的法向应力在40至160 kPa之间变化。试验结果表明，所有砂土工质界面的抗剪强度均随正应力的增加而增加。具有小孔和薄肋的土工格栅显示出最大的界面抗剪强度，而砂土工布界面显示出比砂-沙界面低得多的抗剪强度。在沙-土工格栅界面上可以清楚地观察到应变硬化-软化行为，但是土工织物界面在峰值之后没有任何软化行为。还可以观察到，土工格栅孔中砂的存在主导了砂-土工格栅界面的膨胀性能。这项研究中测试的砂土-格格里德界面的平均界面效率为0.61至0.87。

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