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Analyse aux échelles micro et macroscopique des mécanismes de déssicsation et de gonflement des sols argileux

Abstract : Analysis of the physico-chemical mechanisms at the local or microscopic level during the shrinkage or the swelling of clayey materials is an essential step for the understanding and the characterisation of the sensitivity of soils towards such phenomena (shrinkage and swelling). In order to better understand such mechanisms, experimental analyses are yet performed at different scales, but mainly at a microscopic level using an Environmental Scanning Electron Microscope (ESEM). This apparatus allows the analysis of some features of the behaviour or physical properties of various clay "samples" subjected to controllable hygrometry conditions. In this research, two natural clays, Greek montmorillonite, homogeneous, and Romainville clay, heterogeneous, are analysed in a powder state. These two clays are submitted to wetting/drying cycles in the ESEM chamber. Homogeneous clay has a large swelling and a full destructuration due to wetting and saturation of the powder in water. The heterogeneous clay is studied in the context of relations between spatial scales (microscopic and macroscopic). We observed that the rate of swelling measured at the microscopic level (ESEM) is of the same order of magnitude as that measured at the macroscopic scale (oedometer free swelling tests).
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  • HAL Id : ineris-00973344, version 1
  • INERIS : EN-2009-190

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Tatiana Maison, Farid Laouafa, Jean-Marie Fleureau, Patrice Delalain. Analyse aux échelles micro et macroscopique des mécanismes de déssicsation et de gonflement des sols argileux. 19. Congrès Français de Mécanique (CFM'09), Aug 2009, Marseille, France. pp.NC. ⟨ineris-00973344⟩

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