This paper presents measured deformation of geomembrane installed on slopes of a landfill. The layout of geosynthetics installed on landfill slopes as required by regulations is composed of, in typical, geocomposite, geomembrane, geosynthetic clay liner in turn from the slope. An effort was made to better understand the sources of external forces acting on geosynthetics and their interactions. The results of a field observation indicated that tensile stresses induced on geomebrane were far less in magnitude than predicted by the design method employing mass equilibrium of waste. This was mainly because external forces acting on slopes were not transferred from geocomposite to underlying geomembrane. A simple, but rather rational method for assessing the stability of geosynthetics against tensile stresses was proposed. This method is based on a hypothesis that external forces acting on geosynthetics are the results of downdrag of waste during waste compaction.
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