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Investigation of Post-Shear Surface Texture Characteristics of Geomembranes
2D and 3D surface characteristics of virgin and post-shear geomembranes were investigated using optical interferometry. Shear response of geonet-smooth geomembrane (INT1) and geocomposite-textured geomembrane (INT2) interfaces were determined using inclined plane tests at low normal stress representing landfill covers. Geomembrane surfaces were modified significantly due to shearing. For INT1, the static interface friction angle increased with shear deformation. Geonet ribs ploughed into the geomembrane creating permanent, spatially oriented indentations. Roughness, developed surface area, peak material volume, valley void volume, and natural volume increased, whereas absolute surface area remained similar. For INT2, the static interface friction angle decreased with shear displacement. The geomembrane asperities were deformed by the geotextile filaments from the geocomposite. The peak feature widths decreased and peak heights, valley depths, negative volume, and absolute surface area increased. Modified roughness of the smooth geomembrane and deformation mechanisms of the textured geomembrane correlated to the increased and decreased shear resistance, respectively.
Investigation of Post-Shear Surface Texture Characteristics of Geomembranes
2D and 3D surface characteristics of virgin and post-shear geomembranes were investigated using optical interferometry. Shear response of geonet-smooth geomembrane (INT1) and geocomposite-textured geomembrane (INT2) interfaces were determined using inclined plane tests at low normal stress representing landfill covers. Geomembrane surfaces were modified significantly due to shearing. For INT1, the static interface friction angle increased with shear deformation. Geonet ribs ploughed into the geomembrane creating permanent, spatially oriented indentations. Roughness, developed surface area, peak material volume, valley void volume, and natural volume increased, whereas absolute surface area remained similar. For INT2, the static interface friction angle decreased with shear displacement. The geomembrane asperities were deformed by the geotextile filaments from the geocomposite. The peak feature widths decreased and peak heights, valley depths, negative volume, and absolute surface area increased. Modified roughness of the smooth geomembrane and deformation mechanisms of the textured geomembrane correlated to the increased and decreased shear resistance, respectively.
Investigation of Post-Shear Surface Texture Characteristics of Geomembranes
Manheim, D.C. (author) / Yesiller, N. (author) / Hanson, J.L. (author) / Gourc, J.P. (author) / Carbone, L. (author) / Moraci, N. (author) / Carrubba, P. (author) / Pavanello, P. (author)
Geosynthetics, Geosynthetics Conference, 2015 ; 1179-1189
2015
11 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
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