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Poromechanics of partially saturated COx argillite

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2012
auteur(s) Cariou Sophie; Duan Zhibo; Davy Catherine A.; Skoczylas Frédéric; Dormieux Luc
journal (abréviation) Applied Clay Science (Appl Clay Sci)
volume (numéro) 56
  
pages 36 – 47
résumé Our experimental study aimed originally at : 1) measuring argillite Biot’s coefficient; 2) identifying the main drained poro-elastic parameters in the stabilised partially-saturated state. In doing this, we showed that the current isotropic poro-elastic Biot’s model used for COx argillite might be improved. Our work was based on two experimental set-ups: one for drained uniaxial compression, and the second for triaxial ”change in pore pressure” poro-mechanical measurement. The latter was developed to measure poro-elastic parameters for saturated and partially-saturated material using gas as the fluid injected within the porous network. In terms of stiffness, COx argillite was observed transverse isotropic. This was not the case as regards Biot’s tensor which was found isotropic. The apparent Biot’s coefficient was measured equal to 1, whatever the mass water content w(%). Biot’s coefficient was labelled apparent because it was measured at stabilised w(%) (no transient water saturation regime during the tests). This allowed to use the Terzaghi’s definition of effective stress tensor, as the sum of the external hydrostatic stress tensor and of the pore pressure (times the identity tensor). The impact of w(%) on argillite stiffness was also observed.
mots clés Argillite, Poromechanical test, Partially-saturated medium, Transverse Isotropy, Biot’s tensor, Terzaghi’s material
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