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Modélisation de l'endommagement des structures de stockage

Abstract : The purpose of this work is to study the damage of the underground openings excavated in brittle rocks. It is more exactly about the galleries excavated at 420 m of depth in granite of the Lac du Bonnet (Canada). The particular state of the stresses in this site induced a failure around these openings. Bursting of the rock in the form of sc ales is observed in the roof and floor of a circular and an elliptic gallery for which the longest axis is horizontal. On the other hand, an elliptic gallery with a major axis parallel to the direction of the major principal stresses gives a perfect stability. A phenomenological elastodamage model implemented in the 2-D distinct element code (UDEC) made it possible to account for the observations on the various galleries. This two-dimensional modeling simulates perfectly the phenomenon of failure observed. The same model was implemented in the finite differences code (FLAC3D). That makes it possible to deal with three-dimensional problems. An experiment of permeability was carried out in situ to control the groundwater flow in the rock mass. Keys are excavated in a gallery in order to stop the damaged zone where the leakage take precisely place. We have studied the effect of the shape and the depth of the keys on the interruption of the? damage. Calculations showed that the rectangular form is most suitable. Finally we had to study the effect of the tunnel-face on the damage amplification in particular on the walls of the gallery. The results show that a face slope going in the solid mass leads to the less damage.
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Submitted on : Thursday, March 29, 2018 - 12:49:24 PM
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Mustapha Chibout. Modélisation de l'endommagement des structures de stockage. Autre. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL060N⟩. ⟨tel-01750568⟩



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