Recent years have seen a large growth in engineering solutions involving the implementa-tion of geosynthetic materials. One of the key issues concerning the mechanical characterization of geo-synthetics is the friction at soil-geosynthetic and geosynthetic-geosynthetic interfaces. An estimation of this property is very important in optimizing geotechnical solutions such as slope-liner systems, which are very commonly used in landfills and basins. Direct shear-box and inclined-plane experiments have been applied to estimate the characterization of interfacial friction behavior, each with its own specifications and features. To characterize the friction at the geosynthetic interfaces under low vertical stress, the in-clined plane is recommended. A new inclined plane test has been developed in the Department of Civil engineering at the Islamic Azad University (Iran, Arak). Therefore this paper presents results of the first test performed on various interfaces using a new device.
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