RESUME -Cet article présente une modélisation du phénomène d'interaction sol-structure durant la formation d'un fontis par une approche numérique couplée. L'approche utilise un modèle numérique bidimensionnel couplant un code de calcul aux Différences Finies avec un code de calcul utilisant les Eléments Distincts (FLAC et PFC d'Itasca Consulting Group) afin de tirer au mieux partie des performances des deux logiciels.
Abstract. Soil subsidence of various extend and amplitude can result from the failure of underground cavities, whether natural (for example caused by the dissolution of rocks by underground water flow) or man-made (such as mines). The impact of the ground movements on existing structures (houses, buildings, bridges, etc…) is generally dramatic. A large small-scale physical model is developed in order to improve our understanding of the behaviour of the building subjected to ground subsidence or the collapse of cavities. We focus on the soil-structure interaction and on the mitigation techniques allowing reducing the vulnerability of the buildings (structures).
International audienceA physical modeling has been undertaken to study the effectiveness of a mitigation technique (peripheral trench) to protect a residential house undergoing a ground surface subsidence from mining. A simple building model and a foam-material trench model are designed and implemented. Their deformations are measured by Digital Image Correlation (DIC) technique. The 3D physical model was proved very potential to qualitatively study the impact of ground movements on surface structures and the effect of soil-structure interaction. The trench technique was pointed out very effective to protect the building. The strain in the building and its surrounding ground are significantly reduced by the presence of the trench dug around the building
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