Stabilité des carrières souterraines abandonnées en relation avec les fluctuations du niveau d'ennoyage

Abstract : At Château-Landon in 1910 or on the plateau Picard in 2001, the invasion of underground cavities by groundwater after heavy rain has caused surface subsidence and affected people and/or houses. To prevent these risks, INERIS studies the mechanisms of rupture in two underground chalk quarries partially flooded (Saint-Martin-le-Noeud and Estreux, northern France) where are measured the water level and the geomechanical parameters of a pillar (convergence, extension, saturation). At Saint-Martin-le-Noeud, the instrumented pillar is flooded and there is a gradient of water saturation of the rock which penetrates to at least 0.20 m deep and fluctuates depending on the level of flooding. At Estreux, the pillar is episodically flooded by groundwater whose level is situated a few meters down, but its water content increases by capillary with the water level: this causes both fluctuations of the pillar extension and roof-wall convergence.
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  • HAL Id : ineris-00973675, version 1
  • INERIS : EN-2012-281

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Philippe Gombert, Vincent Damart. Stabilité des carrières souterraines abandonnées en relation avec les fluctuations du niveau d'ennoyage. 6. Journées Nationales de Géotechnique et de Géologie de l'ingénieur (JNGG 2012) "Espaces Urbains, Ruraux, Souterrains et Littoraux", Jul 2012, Bordeaux, France. pp.723-730. ⟨ineris-00973675⟩

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