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Un modèle de calcul des hauteurs prévisibles de remontée de fontis à l'aplomb d'exploitations souterraines peu profondes

Abstract : Sinkholes are surface instabilities resulting from the collapse of the overlying rock as a consequence of roof failure above an underground excavation. When the roof failure progress is not stopped mechanically because of the presence of massive beds in the overburden, it spreads gradually to the surface. If space within the old workings is sufficient for the collapsed materials to accumulate without blocking the phenomenon by self-choking, the upward collapse process can reach the surface. To optimise the diagnosis of possible occurrence of subsidence above shallow underground mines, INERIS has developed an analytical modeling of the phenomenon based on a three dimensional volumetric evaluation of the collapsed material. Depending on the characteristics of the underground workings and mechanical properties of overburden, it is possible to define the theoretical height of chimney collapse from which the phenomenon is blocked by self-choking. By comparing the theoretical height with the thickness of overburden, it is possible to determine if this site is, or is not, subject to the development of sinkhole.
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  • HAL Id : ineris-00961756, version 1
  • INERIS : EN-2011-148

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Christophe Didier, Romuald Salmon. Un modèle de calcul des hauteurs prévisibles de remontée de fontis à l'aplomb d'exploitations souterraines peu profondes. Revue française de Géotechnique, 2010, pp.21-36. ⟨ineris-00961756⟩

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