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

Abstract : In order to prevent mine collapses, INERIS studies the mechanisms that initiate rock failure under the influence of water level. Three complementary ways were developed: 1) identification of the behavior of water sensitive rocks, 2) feedback from previous mine collapses and 3) instrumentation of pillars within partially flooded mines. The feedback from the abandoned ChâteauLandon chalk mine collapse (7 deaths in 1910) illustrates the key influence of the sudden water table rise: laboratory tests confirmed chalk mechanical properties are altered in the presence of water (Didier, 2010). The Clamart collapse (30 deaths in 1961) affected another abandoned chalk mine where stability conditions were close to failure during extracation. Although the water role appears less clear in this context, the deepest level was flooded at the time of the collapse and heavy rain have been noticed a few days before the disaster. Concerning in situ experimental monitoring, geomechanical pillar parameters, rock water contents and groundwater table are performed. At Estreux site, the chalk mine is partially flooded every 5-10 years: the convergency and extension speed of the pillar varies with the water table. At Saint-Martin-le-Nœud site, a pillar located in an underground permanent lake shows a gradient of rock water content that fluctuates according to the lake level.
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  • HAL Id : ineris-01869469, version 1

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Philippe Gombert, Marwan Alheib. Stabilité des carrières souterraines abandonnées en relation avec les fluctuations du niveau d’ennoyage. Rapport Scientifique INERIS, 2013, 2012-2013, pp.66-67. ⟨ineris-01869469⟩

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