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COMPORTEMENT DES SOLS FINS UTILISES EN COUVERTURE ETANCHE DES INSTALLATIONS DE STOCKAGE DE DECHETS : APPROCHE EXPERIMENTALE ET NUMERIQUE

Abstract : The behaviour of the Aptienese clay close to water saturation, which is used for landfill cap cover, is studied in the framework of this thesis. Standard experiments (uniaxial compression and triaxial compression tests) and non usual tests (direct tensile tests and splitting tests) were carried out to determine the major parameters. An improvement of the mechanical behaviour of clay by the addition of different kind of fibres is considered. The results were interpreted in order to optimize the set up of materials and especially the clay layer. However, experiments in laboratory are not sufficient and in certain case particularly difficult to lead and interpreted. A numerical modelling was thus considered. The method of the discrete elements was used. It makes it possible to reproduce the mechanical behaviour of granular and cohesive materials in the range of a laboratory scale to a large scale (in-situ tests). A special attention was paid to the modelling of the clay which can be subjected simultaneously to tensile tests and compressive tests. The microstructure of argillaceous material was not reproduced but modelled by an assembly of particles in interaction. Several laws of contact were used. The influence of the microscopic parameters on the macroscopic behaviour of the numerical samples was studied. An application of these results to the simulation of a large rising test was carried out. This work is a first answer to the real mechanical behaviour of a clay barrier used in landfill cap cover application.
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https://tel.archives-ouvertes.fr/tel-00464516
Contributor : Ha Le Thi Ngoc <>
Submitted on : Wednesday, March 17, 2010 - 12:41:47 PM
Last modification on : Friday, November 6, 2020 - 3:49:24 AM
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Hà Lê Thi Ngoc. COMPORTEMENT DES SOLS FINS UTILISES EN COUVERTURE ETANCHE DES INSTALLATIONS DE STOCKAGE DE DECHETS : APPROCHE EXPERIMENTALE ET NUMERIQUE. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00464516⟩

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