Experimental study of the relation between the permeability of kaolinite and its deformation at micro and macro scale

Abstract : We present an experimental study of relations between hydraulic properties of clayey rocks and their deformation at bulk and micro scale. The experimentation is based on triaxial deformation of kaolinitic core samples, on permeability measurements, and on several methods of analysis of the microstructure. To produce the samples, remoulded kaolinite material is consolidated by axial loading up to 20 MPa in an oedometric cell. Then, in a triaxial cell, an undrained stress path is applied in order to induce shearing damage in the sample. The permeability of the sample is measured by fluid flow across the sample. Before and after these hydro-mechanical tests, the evolution and the homogeneity of the pore space and moreover the texture of the material are analysed by X-ray tomography, environmental scanning electron microscopy and thermic neutron diffraction. Contrary to expectations, the permeability at the sample scale does not vary significantly, although quite large deformation is reached. The final deformation is heterogeneous, with well-developed shear bands. It appears that the development of compacting and dilating zones generates a heterogeneous permeability field, which results in a negligible variation of the bulk permeability at the sample scale.
Type de document :
Article dans une revue
International Journal of Rock Mechanics and Mining Science, 2010, 47 (4), pp.559-567. <10.1016/j.ijrmms.2010.04.007>
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-00496407
Contributeur : Gm Aigle <>
Soumis le : mercredi 30 juin 2010 - 15:21:33
Dernière modification le : mardi 30 mai 2017 - 01:02:01

Identifiants

Citation

Suzanne Raynaud, Guy Vasseur, Bernard Celerier, Didier Loggia, Medhi Ghoreychi, et al.. Experimental study of the relation between the permeability of kaolinite and its deformation at micro and macro scale. International Journal of Rock Mechanics and Mining Science, 2010, 47 (4), pp.559-567. <10.1016/j.ijrmms.2010.04.007>. <hal-00496407>

Partager

Métriques

Consultations de la notice

287