Flow Rate Measurement in Multi-Component Geosynthetic Clay Liners
Mesure des débits dans les géofilms bentonitiques
Touze Foltz, N. ; Barral, C. ; Croissant, D. ; Von Maubeuge, K.
Type de document
Chapitre d'ouvrage scientifique
Affiliation de l'auteur
IRSTEA ANTONY UR HBAN FRA ; IRSTEA ANTONY UR HBAN FRA ; IRSTEA ANTONY UR HBAN FRA ; NAUE GMBH AND CO ESPELKAMP-FIESTEL DEU
Résumé / Abstract
A procedure was developed that combines measuring devices from NF EN 14150 for flow rate measurement through geomembranes and a rigid wall permeameter from NF P84-705. The new procedure aims at measuring flow rates through geosynthetic clay liners (GCLs) in order to measure flow rates through multi-component GCLs. The resulting testing device allows one to measure very small variations in volume with time while applying constant hydraulic pressures. The pressure difference applied on both sides of the multi-component GCL specimens varied between 25 kPa and 100 kPa, with the latter value being equal to the one applied across geomembranes in NF EN 14150. Three different multi-component GCLs from two different manufacturers were tested in order to determine the ability of the testing equipment to quantify the flow rate through multi-component GCLs. The flow rate measurement was per-formed after a hydration phase under very low hydraulic head and with a 10 kPa normal load on the specimens in accordance with NF P84-705. Details regarding the experimental conditions that could lead to the development of a standard for the measurement of flow rates through multi-component GCLs are given. Results obtained tend to show that flow rates are 1 order of magnitude larger than the ones usually measured for virgin geomembranes (i.e., 105 m3/m2/d).
Current and Future Practices for the Testing of Multi Component Geosynthetic Clay Liners