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Rôle de l'oxydation chimique et de l'acidification des eaux sur les propriétés minéralogiques et physico-chimiques de la formation argileuse de Tournemire

Abstract : The Tournemire (France) site has been selected for research programmes on deep geological waste disposal in clay-rich rock formation. A railway tunnel is used to study the evolution of rock properties and water-rock interactions in the excavated disturbed zone. Multi-scale and multi-technique investigations were carried out. Experiments and numerical modelling were used to predict changes due to rock mineralogy and water chemistry modifications. The tunnel and galleries digging induces fracture formation. In the altered samples, the clay particles show a better orientation in the stratification plan. The oxidation effect yields to mineralogical transformation on the surfaces of the argillite: oxidation of pyrite, dissolution of calcite, dissolution of illite layers in interstratified I/S and formation of gypsum, Fe-oxi/hydroxides, celestite and jarosite. During cycles of hydration/dehydration, condensation water interacts with the argillite and quickly becomes Ca and SO4-rich.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0199_CHARPENTIER.pdf
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Submitted on : Thursday, March 29, 2018 - 10:40:56 AM
Last modification on : Tuesday, December 15, 2020 - 12:29:42 PM

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  • HAL Id : tel-01746594, version 1

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Delphine Charpentier. Rôle de l'oxydation chimique et de l'acidification des eaux sur les propriétés minéralogiques et physico-chimiques de la formation argileuse de Tournemire. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10199⟩. ⟨tel-01746594⟩

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