Abstract
The summary of this paper is focused on the result of a study that used quantitative measures of surface texture as the basis for examining the effects of asperities on the shear characteristics of geotextile-geomembrane interfaces. About 30 large direct shear tests were conducted to evaluate the geotextile-geomembrane interface shear strength properties. The results indicated a non-linear failure envelopes and strain softening behaviour at a normal stress range of 50 – 400 kPa. For most interface tested, the polyester-geotextiles resulted in higher shear strength as compared with polypropylene-geotextiles. Also, the polyester and polypropylene geotextile interface with the high asperity geomembrane produces a similar percentage increase in friction angle at the residual state. For textured geomembranes interfaced with both geotextile, polyester geotextile exhibited relatively less time before failure. Also, asperity height has a more pronounced effect than asperity density on the residual interface shear strength. The outcome of this study would provide a recommendation and guide that can lead to an improved basis for geosynthetics selection in various engineering application.
Highlights
Landfills are an important structure in our modern society and are designed to allow maximum accumulation of wastes in the least space and prevent environmental contamination [1]
The lining systems are made of different geosynthetics including geomembranes, geotextiles, geonets, geosynthetics clay liners (GCL), geomaterials and granular materials usually interacting with each other
A textured geomembrane with upper and/or lower asperity surfaces is intended to increase the interface shear strength when compared with the smooth geomembrane interface strength
Summary
The experiment setup consisted of geomembrane asperity height and density measurement. Asperity height for each textured geomembrane was measured in mm with a dial. Asperity concentration/density was measured per 100-millimetre square with a calibrated metal square and mathematically extrapolated to meter square. After quantifying each geomembrane asperity, a series of about 30 large direct interface shear tests were carried out to investigate interface shear behaviour between geomembranes and geotextiles
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