ANALYSIS OF TENSION OF GEOMEMBRANES PLACED ON LANDFILL SLOPES

摘要

In engineered landfills, geomembranes are commonly used to isolate waste from the surrounding ground and groundwater in order to minimize the potential groundwater contamination. On the sides of a landfill, geomembranes are placed on prepared sloped surfaces and anchored at the crest level. Subsequent construction of a landfill includes the placement of soil cover and waste layers up various heights over these liners. This can result in application of substantial down-slope shear stresses on the geomembranes leading to development of significant geomembrane tension which is necessary to be studied so as to ensure the safety use. In this paper, three-states elastic-plastic model is presented to simulate the shear deformation property for the geomembrane-clay interface, and the governing differential equations of three states are got. Because the demarcation points among three states are unknown, the iterative computation method should be used to compute the tension of geomembrane. Finally, the important factors, including overburden height,slope gradient and geomembrane parameters, which influence the tension of geomembrane, are studied.