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<p>As the geomembrane-soil interface is generally the weakest in terms of shear resistance, it is crucial to evaluate its performance in terms of stability for geotechnical structures using geomembrane as a liner material. This study focuses on sand-geomembrane interface shear strength performance, which is non-dilative in nature. Interface shear tests were performed on three geomembranes of different thickness (0.5, 1 and 1.5&#xa0;mm) with three sands of different gradation at two strain rates. Further the effect of surface roughness of geomembrane was evaluated by performing tests on rough and smooth geomembrane. The microscopic analysis of the sheared geomembranes was conducted using an optical microscope that gives qualitative information of sheared geomembranes. Experimental studies revealed that for each test configuration, as the normal stress increases the interface shear resistance increases. With increase in particle size the contact points reduce leading to a decrease in shear resistance. Similarly, apart from geomembrane surface roughness, interface shear resistance is inversely proportional to all other parameters i.e., particle size, strain rate and geomembrane thickness. Microscopic analysis of the sheared smooth geomembrane surfaces revealed a slide-stop mechanism mobilized at the interface. Finding of the study are significant to understand the influence of various parameters that influence shear resistance of sand-geomembrane interface at micro and macro level.</p>

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Experimental Investigation of Factors Influencing the Shear Behaviour of Sand–Geomembrane Interfaces

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Tanmaya M. B.,
  • Aali Pant

摘要

As the geomembrane-soil interface is generally the weakest in terms of shear resistance, it is crucial to evaluate its performance in terms of stability for geotechnical structures using geomembrane as a liner material. This study focuses on sand-geomembrane interface shear strength performance, which is non-dilative in nature. Interface shear tests were performed on three geomembranes of different thickness (0.5, 1 and 1.5 mm) with three sands of different gradation at two strain rates. Further the effect of surface roughness of geomembrane was evaluated by performing tests on rough and smooth geomembrane. The microscopic analysis of the sheared geomembranes was conducted using an optical microscope that gives qualitative information of sheared geomembranes. Experimental studies revealed that for each test configuration, as the normal stress increases the interface shear resistance increases. With increase in particle size the contact points reduce leading to a decrease in shear resistance. Similarly, apart from geomembrane surface roughness, interface shear resistance is inversely proportional to all other parameters i.e., particle size, strain rate and geomembrane thickness. Microscopic analysis of the sheared smooth geomembrane surfaces revealed a slide-stop mechanism mobilized at the interface. Finding of the study are significant to understand the influence of various parameters that influence shear resistance of sand-geomembrane interface at micro and macro level.