| Issue |
E3S Web Conf.
Volume 92, 2019
7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019)
|
|
|---|---|---|
| Article Number | 13017 | |
| Number of page(s) | 5 | |
| Section | Behaviour at Geotechnical Interfaces | |
| DOI | https://doi.org/10.1051/e3sconf/20199213017 | |
| Published online | 25 June 2019 | |
Asperities effect on polypropylene & polyester geotextile-geomembrane interface shear behaviour
1
Department of Civil Engineering, University of Cape Town, Cape Town, South Africa
2
Fibertex South Africa, Johannesburg, South Africa
* Corresponding author: adldan002@myuct.ac.za
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.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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