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Microstructural investigation on mechanical behavior of soil-geosynthetic interface in direct shear test

机译：直接剪切试验中土工合成材料界面力学行为的微观结构研究

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Interface shear strength between soil and geosynthetics mainly depends on the mechanical and physical properties of soil, geosynthetics and the normal stress acting at the interface. This paper presents results of an extensive experimental investigation carried out on sand-geosynthetic interface using modified large direct shear box. The study focusses on the shearing mechanism at the sand-geosynthetic interface and the effect of different parameters on the shearing mechanism. Smooth HDPE geomembrane, nonwoven needle punched geotextile and two types of sand having different mean particle size, have been used in the present study. Microstructural investigation of deformed specimen through Field Emission Scanning Electron Microscope (FESEM) reveals the shearing mechanism which includes interlocking and fiber stretching for sand-geotextile while sliding, indentation and plowing for sandgeomembrane interface. The shearing mechanism for sand-geomembrane interface highly depends on the normal stress and degree of saturation of sand. The critical normal stress that demarcates the sliding and plowing mechanism for sand-geomembrane interface is different for dry and wet sand. The amount of scouring (or plowing) of the geomembrane surface reduces with increase in the mean particle size of sand. FESEM images revealed that the sand particles get adhered to the geotextile fibers for tests involving wet sands. The present microstructural study aided in understanding the shearing mechanism at sand-geosynthetic interface to a large extent. (C) 2017 Elsevier Ltd. All rights reserved.
机译：土壤与土工合成材料之间的界面抗剪强度主要取决于土壤的力学和物理特性，土工合成材料以及作用在界面上的法向应力。本文介绍了使用改进的大型直接剪切箱在砂土工质界面上进行的广泛实验研究的结果。研究的重点是砂土-土工合成材料界面处的剪切机制以及不同参数对剪切机制的影响。本研究中使用了光滑的HDPE土工膜，无纺针刺土工布和两种具有不同平均粒径的砂子。通过场发射扫描电子显微镜（FESEM）对变形试样的显微组织研究揭示了剪切机制，包括互锁和纤维拉伸，用于砂土工织物，同时滑动，压痕和犁入砂土工膜界面。砂土膜界面的剪切机理在很大程度上取决于法向应力和砂土的饱和度。区分砂土工膜界面滑动和耕作机制的临界法向应力对于干砂和湿砂是不同的。土工膜表面的冲刷（或耕作）量随沙子平均粒径的增加而减少。 FESEM图像显示，沙粒附着在土工纤维上，用于涉及湿沙的测试。目前的微观结构研究有助于在很大程度上了解砂土-土工合成材料界面的剪切机理。 （C）2017 Elsevier Ltd.保留所有权利。

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