The base liner system of modern landfills include several layers of soil and geosynthetic materials. The several geosynthetic/geosynthetic and soil/geosynthetic contact surfaces, usually represent potential locations of sliding movement in case of instability. Due to the scarcity of land, and economic reasons, modern landfills are being constructed with relatively steep side slopes. As a result, it is necessary to obtain proper estimates of the shear strength properties of geosynthetic interfaces in order to perform reliable stability analyses. This paper describes some of the commonly used landfill liner configurations and discusses the interface shear strength properties of different geosynthetic liner components. Experimental methods to estimate both the static and dynamic frictional properties are presented. Finally, some of the factors that influence the shear strength parameters of geosynthetic interfaces are discussed.
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