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Focus : Évaluation de la protection contre l'endommagement des géomembranes en polyéthylène haute densité Evaluation of HDPE geomembranes protection against puncturing

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Author(s): CROISSANT, Didier ; TOUZE-FOLTZ, Nathalie

Journal: Sciences Eaux & Territoires : la Revue du IRSTEA
ISSN 2109-3016

Volume: 2012;
Issue: 08;
Start page: 44;
Date: 2012;
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Keywords: Géotextiles | Géomembrane | PEHD | Poinçonnement | Protection | Essais.

ABSTRACT
En fond d'installation de stockage des déchets, les géomembranes constituant la barrière d'étanchéité sont soumises à des sollicitations pouvant endommager leur fonctionnement. Pour éviter le risque de perforation et de fuite, un géotextile de protection est généralement mis en place. Focus sur les tests de performance de plusieurs types de géotextiles et premières recommandations quant aux caractéristiques minimales à respecter pour éviter l'endommagement.Geotextiles are used in the constitution of landfill lining systems in order to protect the geomembrane against puncturing effects during installation of the granular drainage layer, then during the life of the landfill site, in relation with the weight of waste. The objective of this paper is to evaluate the performance of nonwoven needlepunched geotextiles having an average mass per unit area equal to 1000 g/m² in protecting geomembrane, bases on static puncture tests performed in 1m diameter cells. Those tests were previously developed by Aufrère et al. (2009). Recommendations are given in the following as regards the length of fibers, the elasticity modulus, the masse per unit area and the thickness of the geotextile depending on the nature of granular material used.
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