A multi-scale study of water transfer through clayey geomaterials in landfill cap covers

Camille Barral, Irini Djeran-Maigre, Patrick Pierson, Gérard Didier

Abstract

The cap cover of a municipal solid waste landfill, must ensure the containment of the wastes, control rainwater infiltrations and limit biogas leakage to the atmosphere. The specific characteristics of the cap cover are necessary to be maintained during all the lifespan of the landfill, despite the loadings to which it is subjected to: mechanical stresses, hydraulic load changes, physico-chemical variations and changes of climatic conditions. The water transfer through the clayey geomaterials, geosynthetic clay liners (GCL) installed as capping in landfill, is studied at three different scales. In-situ large scale experiments, laboratory experiments and intermediate scale experiments were conducted. Barriers remained effective after two years following installation. Percolation rates were less than 1% of the rainfall and the ion exchange in the GCL was 180 times lower than the initial. However, hydraulic conductivity increased slightly due to desiccation.

Keywords

Geosynthetic Clay Liner, Landfill Cap Cover, Hydraulic Permeability, Lysimeter, Pilot Experiments, Cation Exchange, Laboratory Test

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IMEKO-TC4-GEO-2016-12.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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