The aim of this study is to investigate the behavior of geomembrane-gravel interfaces both in terms of resistance to shear and resistance to puncturing. Different geomembranes are submitted to puncture tests and direct shear tests in contact with the same specific gravel. The aspect of the geomembrane after shear testing is also considered as part of the result. Results obtained illustrate the significant interface behavior differences according to the thickness and type of the geomembrane and the moisture of the interface, with or without protective geotextile. Considering a 30 mm or a 50 mm displacement for the calculations generally leads to the same shear characteristics. Puncture resistance of geomembranes are shown to be highly variable from one type of geomembrane to another. Interesting data concerning shear-damage of the geomembranes are also given and compared with results obtained performing the gravel puncturing test, showing that solicitations are definitely different.
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