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Fluage et endommagement des roches argileuses : évolution de la microstructure et modélisation phénoménologique

Abstract : The underground radioactive waste disposal far exceeds the period of exploitation of common civil engineering works. These specific projects require to predict the irreversible deformations over a large time scale (several centuries) in order to assess the extension and to forecast the evolution of the EDZ (Excavation Damage Zone) around the cavity. In this study, the viscosity of three sedimentary argillaceous rocks has been studied under different conditions of uniaxial compression: static or cyclic creep tests, monotonic and quasistatic tests, performed across various strata orientations. Argillaceous rocks are studied as a possible host layer for radioactive waste disposals. Indeed, they present some of the physical characteristics and mechanical properties, which are essential for being a natural barrier: low permeability, high creep potential and important holding capacity of radioactive elements. The purpose of the experimental study was to shed some light over the mechanisms governing the development of delayed deformations and damage of argillaceous rocks. It relates three rocks: an argillite from East of France, a Tournemire argillite and a marl from Jurassic Mountains. On atomic scale, viscoplastic deformations are due to irreversible displacements of crystalline defects, called dislocations. The experimental study was also supplemented with observations on thin sections extracted from the argillite and marl samples using a SEM. The aim was to identify the mechanisms responsible for the time-dependent behaviour on a microstructural scale. Analytical simulations of the mechanical behaviour of the three rocks gave parameters used in different viscoplastic models. The best modeling was obtained with the viscoplastic model which takes account of the development of volumetric strains and of the damage anisotropy.
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Contributor : Géraldine Fabre <>
Submitted on : Monday, July 25, 2005 - 5:40:00 PM
Last modification on : Friday, November 6, 2020 - 3:55:22 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:12:17 PM

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  • HAL Id : tel-00009830, version 1

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Géraldine Fabre. Fluage et endommagement des roches argileuses : évolution de la microstructure et modélisation phénoménologique. Géologie appliquée. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00009830⟩

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