Abstract(s) :

(Anglais) The Trou Loulou is an old underground soft carbonate quarry located in Eastern Belgium. This shallow depth room-and-pillar quarry was mined out from the 16th century for building stone. Now, it is considered as a cultural heritage. In the same area, an open-pit quarry is currently mining carbonated rocks for cement production. The Trou Loulou is located in the extension of this open-pit quarry. Therefore, a stability study was required for determining the security distance between both sites in order to preserve this heritage when the open-pit comes closer to it. In this paper, we first describe the geological context. A conceptual model is derived from 2D and 3D surveying of the site. In situ and laboratory mechanical characterizations are performed and a stability analysis is proposed using 2D finite element modelling. Progressive simulation of the open-pit quarry shows the occurrence of localized roof failure.