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Perméabilité des massifs rocheux faiblement perméables : application à l'estimation de l'endommagement

Abstract : Excavation of underground openings generally causes damage to the surroundings. The hydraulic properties of the excavation disturbed zone (EDZ) are different from the Test of the rock mass, and are of major interest concerning the safe sealing of underground radioactive waste repositories. Permeability measurement probe (SEPPI) is used to characterize the excavation damage zone. The experimental method is a pulse test which is suitable for low rock permeability (10-14 - 10-22m2). Modelling with direct problem permits to understand both the initial hydraulic boundary conditions importance and the variability of pore water pressure in space and time around the borehole. ln order to account for comprehension of initial conditions, the probe was modified next to a few permeability measurements campaign in international laboratories (HRL, URL, Mont Terri et Tournemire). The new tool give some satisfying results in cristalline rock mass and even in shales. The use of fractional flow dimension in the interpretation methods shows the existence of damage zone around the borehole created during its boring and permits to integrate this zone in the model interpretation: Mechanical modelling validate the estimation of EDZ obtained with in situ permeability measurements. At least, the last Mont Terri sismic velocity measurements comfirm the existence of the EDZ next to the borehole wall and also validate entirely the assumptions of our interpretation model
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  • HAL Id : tel-01750630, version 1



Stéphane Pepa. Perméabilité des massifs rocheux faiblement perméables : application à l'estimation de l'endommagement. Autre. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL106N⟩. ⟨tel-01750630⟩



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