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Engineered capping systems for landfills are an important tool in the containment strategy for waste disposal. The principal goal of an engineered landfill capping system is to prevent or control infiltration of precipitation, thereby controlling or preventing leachate production and to control the development and emission of landfill gas, thus preventing its emission into the atmosphere. The landfill cap is a composite system of soil layers and geosynthetic components. Steeply sloped sections of capping sealing systems are permanently subjected to shear stresses which require a detailed design of the stability of the sealing system against sliding keeping in mind individual construction stages, operating conditions as well as the long aftercare period or reuse. According to experience a so called “veneer reinforcement” is required in cases where the slope of a landfill cap exceeds an inclination of approx. 20°. The geogrid absorbs the “deficit resistance”, which cannot be provided by the sealing system itself due to insufficient interface friction. In this paper the characteristics of the veneer reinforcement design as well as construction details will be addressed based on two landfill case studies from South Africa and Germany. In addition to this results of a monitored landfill veneer reinforcement project will be presented, which allows the comparison of measured deformations in the reinforcement to those predicted by current design standards.
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