Design and construction of inclined plane device for modeling the interface interaction of geosynthetic layers
One of the important applications of geosynthetics in the earth's slopes, such as landfills and waste disposal areas, is to use them as liner system. Proper assessment of the interaction of geosynthetics at slopes, such as landfill, is an important issue in preventing the slip and instability of the slopes. The inclined plane is a suitable method for assessing the interaction between the geosynthetics interacting in a sloping and tilted state under low normal stresses. The European Standard EN ISO 12957-2 provides a "standard displacement" for estimating the geocynthetic interface's friction angle. In this paper, inclined plane device, which for the first time in Iran was completely designed and constructed, describes the technical characteristics of the device and prepares the sample. This apparatus has the ability to perform experiments to investigate the interaction of soil-soil, soil-geosynthetics and geosynthetic-geosynthetic interfaces at low normal stress. Experiments are carried out on geomembrane and geotextile types to investigate the interaction of their surface. By changing the type of geosynthetics, it was observed that friction angle of geosynthetic interfaces is not constant and depends on the type of geomembrane and the woven or non-woven geotextile. The geomembrane-geotextile interface is the least amount of geomembrane with hard polyethylene, and the highest amount is used when polyvinyl chloride is used.
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