The use of drainage geocomposites (GCD) coupled with various geosynthetics has become a common practice in landfill covering and lining systems. The global stability of these systems is closely related to the interface shear strength, which, in his, is affect by many parameters and testing conditions. Therefore, the relevant evaluation of the interface friction angle is a key issue for the liners design and performance. From literature, one of the most suitable methods to investigate the geosynthetic interface shear strength under low pressures is the inclined plane device. This paper summarizes the results of an inclined plane test program carried on for three different types of interfaces, widely used in landfill lining systems: GCD – GCL (geosynthetic clay liner), GCD – GGR (geogrid) and GCD – GMT (reinforced geomat). Moreover, in the research the effects of dry and wet conditions and of progressive damage, induced by relative displacement, were investigated.
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