Comparative study of hydraulic behaviour of Geosynthetic Clay Liners exhumed from a landfill cover and from a dam after several years in service
Etude comparative du comportement hydraulique de géosynthétiques bentonitiques excavés d'une couverture d'installation de stockage de déchets et d'un barrage après plusieurs années de service
Barral, C. ; Touze-Foltz, N. ; Loheas, E. ; Croissant, D.
Type de document
Communication scientifique avec actes
Affiliation de l'auteur
IRSTEA ANTONY UR HBAN FRA ; IRSTEA ANTONY UR HBAN FRA ; IRSTEA ANTONY UR HBAN FRA ; IRSTEA ANTONY UR HBAN FRA
Résumé / Abstract
A significant number of studies have been published on the field performance of Geosynthetic Clay Liners (GCLs) in landfill covers while the use of GCLs in dams and dikes is more recent and therefore needs more studies. Samples of GCLs were exhumed after several years of service from a landfill final cover and from a dam. The samples were tested for water content, swell index, hydraulic conductivity and exchangeable cations. The tests performed showed that the hydraulic conductivity and swell index of the bentonite evolved at the contact of the surrounding soil which contained calcium. Depending of the duration of service of GCL, very different hydraulic conductivities were obtained (up to 3 orders of magnitude) in relation with the number of hydration-desiccation cycles experienced by the GCLs. Those results will be discussed in the light of previous results obtained on excavations and in tests performed with calcium chloride solutions.
Eurogeo 5, 16/09/2012 - 19/09/2012, Valence, ESP