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COMPORTEMENT MECANIQUE ET RUPTURE DANS LES ROCHES ARGILEUSES ETUDIES PAR MICRO TOMOGRAPHIE A RAYONS X

Abstract : WITHIN THE FRAMEWORK OF FEASABILITY STUDIES OF UNDERGROUND REPOSITORIES FOR RADIOACTIVE WASTE, THE STUDY OF PERMEABILITY EVOLUTION WITH DAMAGE OF THE HOST LAYER IS CRUCIAL. THE GOALS OF THIS WORK WERE : (i) TO CHARACTERIZE EXPERIMENTALLY THE DAMAGE OF TWO CLAYEY ROCKS (BEAUCAIRE MARL AND EAST SHALE) WITH X-RAY MICRO TOMOGRAPHY, (ii) TO DEVELOPP A HIGH PRESSURE TRIAXIAL SET-UP ADAPTED TO PERMEABILITY MEASUREMENT ON VERY LOW PERMEABILITY ROCKS.A NUMBER OF ORIGINAL TRIAXIAL DEVICES HAVE BEEN REALISED TO CHARACTERIZE DAMAGE OF CLAYEY ROCKS, UNDER DEVIATORIC LOADING, WITH X-RAY MICRO TOMOGRAPHY ON A SYNCHROTRON BEAMLINE AT THE ESRF (GRENOBLE). LOCALIZED DAMAGE AND ITS EVOLUTION HAVE BEEN CHARACTERIZED AT A FINE SCALE (OF ORDER OF TEN MICRONS). DIGITAL IMAGE CORRELATION TECHNIQUES, EXTENDED TO 3D IMAGES, HAVE BEEN USED TO MEASURE INCREMENTAL STRAIN FIELDS FROM TOMOGRAPHIC IMAGES. WE DEMONSTRATED THAT THESE TECHNIQUES ARE VERY USEFUL IN THE STUDY OF THE LOCALIZED DAMAGE OF GEOMATERIALS AND ESPECIALLY FOR THE INITIATION.A HIGH PRESSURE TRIAXIAL DEVICE HAS BEEN REALISED TO MEASURE PERMEABILITY EVOLUTION OF THE EAST SHALE AS A FUNCTION OF APLLIED STRESS (ISOTROPIC AND DEVIATORIC). THE PARTICULARITY OF THIS SET-UP IS THE SMALL SIZE OF THE TEST SPECIMEN (CYLINDER OF 10MM IN DIAMETER AND 20MM IN HEIGHT) WHICH ALLOWS SIGNIFICANT REDUCTION OF TEST DURATION.
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https://tel.archives-ouvertes.fr/tel-00011996
Contributor : Nicolas Lenoir <>
Submitted on : Tuesday, March 21, 2006 - 12:17:22 PM
Last modification on : Thursday, November 19, 2020 - 3:54:38 PM
Long-term archiving on: : Saturday, April 3, 2010 - 8:37:35 PM

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  • HAL Id : tel-00011996, version 1

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Nicolas Lenoir. COMPORTEMENT MECANIQUE ET RUPTURE DANS LES ROCHES ARGILEUSES ETUDIES PAR MICRO TOMOGRAPHIE A RAYONS X. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00011996⟩

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