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- W614066744 abstract "The use of geosynthetics in landfill construction introduces potential planes ofweakness. As a result, there is a requirement to assess the stability along thesoil/geosynthetic and geosynthetic/geosynthetic interfaces. Stability is governedby the shear strength along the weakest interface in the system. Repeatabilityinterface shear strength testing of a geomembrane/geotextile interface at lownormal stresses suitable for capping systems showed considerable variability ofmeasured geosynthetic interface shear strengths, suggesting that minor factorscan have a significant influence on the measured shear strength. This studydemonstrates that more than one test per normal stress is necessary if a moreaccurate and reliable interface shear strength value is to be obtained. Carefullycontrolled inter-laboratory geosynthetic interface shear strength comparison testsundertaken on large direct shear devices that differ in the kinematic degrees offreedom of the top box, showed the fixed top box design to consistently overestimate the available interface shear strength compared to the verticallymovable top box design. Results obtained from measurement of the normalstress on the interface during shear with use of load cells in the lower box of thefixed top box design, raise key questions on the accuracy, reliability and properinterpretation of the interface shear strength data used in landfill designcalculations. Tests on the geocomposite/sand interface have shown the interfacefriction angle to vary with the orientation of the geocomposite's main core, inrelation to the direction of shearing. Close attention needs to be paid to the onsitegeocomposite placement in confined spaces and capping slope corners, as grid orientation on the slope becomes particularly important when sliding isinitiated. Attempts to measure the pore water pressure during staged consolidation and shear along a clay/geomembrane interface in the large direct shear device suggest that this interface is a partial drainage path." @default.
- W614066744 created "2016-06-24" @default.
- W614066744 creator A5022325276 @default.
- W614066744 date "2006-01-01" @default.
- W614066744 modified "2023-09-26" @default.
- W614066744 title "Investigating the stability of geosynthetic landfill capping systems" @default.
- W614066744 hasPublicationYear "2006" @default.
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