Investigation of friction between gravely sand or non-woven geotextile and textured HDPE geomembrane with usage of inclined plane test
2018
Pawlowski, A., Institute of Building, Wroclaw (Poland)
Friction is the most important stability factor in every soil-geotextile-geomembrane system placed on a slope. HDPE geomembrane, which is widely used in watertight sealing systems, has relatively low friction coefficient limiting inclination of earth structures planes to ensure enough safety against sliding of covering soil layers. To increase friction forces on the contact planes and thus range of application, different texture patterns increasing geomembrane surface roughness are used. A newly developed pattern of geomembrane surface texture was tested. Inclined plane test - which is a good model of real condition on a slope - was used to determine friction characteristics between textured geomembrane and soil. The speed of plane platform lifting (rotation) was regulated by multitest-tensile strength testing machine controlled by an individually created computer program. Geomembrane was fixed to the platform plane (Fig. 1, 2). Plane inclination was growing with constant speed 3°/min, as recommended by the standard PNEN ISO 12957 – 2:2007 [1]. Influence of compaction and of moisture content of the soil on friction coefficient was investigated. Because very often non-woven geotextiles are used in sealing systems as protection layer, friction coefficient between geotextile and geomembrane was tested, too.
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