Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Importance of Variability in the Interface Shear Strength between Textured Geomembrane and Geocomposite Drainage Layer in Landfill Covers
A common interface in landfill covers is between a textured geomembrane and an overlying geocomposite drainage layer. The shear strength of this interface is particularly important for stability since it is subjected to water pressures that develop in the drainage layer. The shear strength of this interface can exhibit significant variability at the low effective normal stresses present in a landfill cover. The objective of this paper is to provide insight into how the variability of this interface affects the interpretation of laboratory test results and their use in stability analyses. Laboratory tests are presented and analyzed, leading to the following conclusions: (1) The texturing on blown-film textured geomembranes can be highly variable locally within a sheet as well as between rolls. The height and density of asperities, as well as their shapes, are variable. (2) This variability in texturing can lead to significant variability in the peak interface shear strength, with a coefficient of variation in the peak friction coefficient of about 0.15. (3) These local variations in texturing and interface shear strength are not generally important to the overall stability of a landfill cover slope because the area of the slip surface is typically much larger than the scale of variations. It is the average shear strength from test results and not the minimum tests result that is relevant. (4) In QA/QC, these local variations are important in establishing the number of tests and the criterion for accepting or rejecting material based on the test results. A minimum of five to ten tests are recommended to assess the average peak shear strength for this interface, and the criterion for accepting and rejecting material is best based on the average test result rather than the minimum result.
Importance of Variability in the Interface Shear Strength between Textured Geomembrane and Geocomposite Drainage Layer in Landfill Covers
A common interface in landfill covers is between a textured geomembrane and an overlying geocomposite drainage layer. The shear strength of this interface is particularly important for stability since it is subjected to water pressures that develop in the drainage layer. The shear strength of this interface can exhibit significant variability at the low effective normal stresses present in a landfill cover. The objective of this paper is to provide insight into how the variability of this interface affects the interpretation of laboratory test results and their use in stability analyses. Laboratory tests are presented and analyzed, leading to the following conclusions: (1) The texturing on blown-film textured geomembranes can be highly variable locally within a sheet as well as between rolls. The height and density of asperities, as well as their shapes, are variable. (2) This variability in texturing can lead to significant variability in the peak interface shear strength, with a coefficient of variation in the peak friction coefficient of about 0.15. (3) These local variations in texturing and interface shear strength are not generally important to the overall stability of a landfill cover slope because the area of the slip surface is typically much larger than the scale of variations. It is the average shear strength from test results and not the minimum tests result that is relevant. (4) In QA/QC, these local variations are important in establishing the number of tests and the criterion for accepting or rejecting material based on the test results. A minimum of five to ten tests are recommended to assess the average peak shear strength for this interface, and the criterion for accepting and rejecting material is best based on the average test result rather than the minimum result.
Importance of Variability in the Interface Shear Strength between Textured Geomembrane and Geocomposite Drainage Layer in Landfill Covers
Dellinger, Gregory (Autor:in) / Lacey, Richard (Autor:in) / Allen, John (Autor:in) / Gilbert, Robert (Autor:in)
2013
10 Seiten, Bilder, Tabellen, Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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