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An investigation of shear mechanisms at interfaces between needle punched nonwoven geotextiles and HDPE geomembranes revealed that strain within the geotextile significantly reduces the interface resistance against both smooth and textured geomembrane surfaces. A combination of sliding and plowing mechanisms was found to yield the peak interface response of geotextiles sheared against smooth geomembrane surfaces. The primary contributing factors to shear evolution for unconstrained and constrained geotextiles sheared against moderately textured geomembranes are the confined tensile behavior of the geotextiles and the strength of the geomembrane texture elements, respectively. The shear-induced micromechanical interaction of the filament-texture system was observed using digital image analysis techniques and the resulting change in void structure was quantified in terms of local void ratio distribution and largest inscribing void size distribution.
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