Back-analysis of the collapse of the clamart chalk underground quarry - Paris (France)

Abstract : Many large collapses have occurred during or after underground quarry operations. The collapse of the Clamart underground quarry (in 1961, South of Paris-France) is well known as one of the most catastrophic. This paper presents a back-analysis of the case study using an empirical approach. Based on a set of assumptions, the empirical approach has indicated a reliable scenario that may explain the collapse: the large collapse may have been caused by a lack of bearing capacity of the pillars and the sudden failure of a hard limestone bed in the roof, the load on which would have been concentrated until overload occurred. The bed weakness between the two quarrying levels may also have had an influence on the general lack of stability of the quarry. Moreover, under the given hypothesis, the study shows a very low influence of the water table due to flooding of the underground quarry. RÉSUMÉ Les effondrements peuvent affecter les cavités souterraines pendant et après le creusement. L'effondrement historique en 1961 de la carrière de Clamart (sud de Paris – France) est connu comme le plus catastrophique. Cet article présente une rétro-analyse basée sur une approche analytique-empirique. Les résultats ont montré que la cause principale de l'effondrement est l'insuffisance de la résistance des piliers et la rupture brutale du banc de calcaire du haut toit. Les piliers ont été stables grâce à la présence du banc de calcaire dans le toit. D'autres facteurs comme l'ennoyage et la rupture de l'intercalaire ont également contribué à l'effondrement, avec un rôle moins important .
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Marwan Al Heib, Christophe Duval, Jean-Marc Watelet, Philippe Gombert. Back-analysis of the collapse of the clamart chalk underground quarry - Paris (France). 16. European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE 2015), Sep 2015, Edinburgh, United Kingdom. ⟨ineris-01855095⟩

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