Skip to Main content Skip to Navigation

Étude du comportement anisotrope de l'argile de Boom

Abstract : In the program of deep geological radioactive waste disposal in Belgium, Boom Clay has been chosen as one of the potential host rocks. Due to the geological stratification, this stiff clay has been regarded as a transverse isotropic material. The anisotropy of its hydraulic and thermal properties was shown in several studies. It seems necessary now to conduct a more in-depth study on the anisotropic behaviour of Boom Clay. In terms of experimental works, the anisotropy of the thermo-hydro-mechanical properties of Boom Clay was evidenced using measurements of thermal conductivity, hydraulic conductivity and small-strain shear modulus. Through these measurements on freshly cored Boom Clay samples, the damage due to excavation of the gallery was identified (in the zone near the Connecting gallery at Mol, Belgium) and modelled using an empirical model in which the damage variable is based on the volume of macro-pores. Afterwards, the anisotropy behaviour under K0 condition was studied by analysing the behaviour of three types of specimens (0°, 45°, and 90° to the bedding plane) during and after the re-saturation in the triaxial and oedometer cells under different stress states. Finally, the anisotropic behaviour under triaxial condition was investigated through several triaxial tests on three types of specimens. During these tests, the velocity measurements of seismic waves Vs et Vp were performed thanks to the bender elements installed in the upper and bottom bases of a triaxial cell. These results were used to determine the parameters of anisotropic elasticity. In terms of modelling works, an anisotropic model with eight anisotropic parameters (fives elastic parameters and three plastic parameters) was developed using the theory of Boehler (Boehler et Sawczuk, 1977). This model is based on an elasto-plastic isotropic model with two yield surfaces elaborated previously for Boom Clay (Hong, 2013). The validation of this anisotropic model was made based on the results obtained from oedometer and triaxial tests performed in this study
Complete list of metadata

Cited literature [249 references]  Display  Hide  Download
Contributor : ABES STAR :  Contact
Submitted on : Monday, September 28, 2015 - 2:37:06 PM
Last modification on : Saturday, January 15, 2022 - 3:48:57 AM
Long-term archiving on: : Tuesday, December 29, 2015 - 10:31:06 AM


Version validated by the jury (STAR)


  • HAL Id : tel-01206132, version 1


Linh Quyen Dao. Étude du comportement anisotrope de l'argile de Boom. Matériaux et structures en mécanique [physics.class-ph]. Université Paris-Est, 2015. Français. ⟨NNT : 2015PEST1047⟩. ⟨tel-01206132⟩



Record views


Files downloads