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Hydro-mechanical response of the Tournemire argillite to the underground openings excavation: unsaturated zones and mine-by-test experiment



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Titre du congrès :GeoProc 2008 - 3rd International Conference on coupled T-H-M-C processes in geo-systems
Ville du congrès :Lille
Date du congrès :02/06/2008


A mine-by-test has been performed in the Tournemire experimental site, during the excavation of a new gallery in 2003. This experiment shows that the excavation in the Tournemire argillite generate hydro-mechanical disturbances which can extend up to 4 to 6 times the mean radius of the gallery. These hydro-mechanical disturbances due to the excavation are not as important as the hydric ones due to the desaturation/resaturation processes which take place after excavation. Indeed, the hydric disturbances induced the development of some micro-cracks mainly parallel to the bedding planes which form the current damaged zone ofthe gallery.