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).
Disconnected piled raft (DPR) or non-connected piled raft is a foundation approach with highly growing interest over the past few decades. This technique, where the raft is separated from the piles by interposing a load transfer platform (LTP), allows engineers to apply a much lower safety factor against structural failure compared to the piled foundations in which piles are structurally connected to the raft. Also possible damage to structural connections is no longer a design issue, and the horizontal loads can be effectively transmitted through the mobilized frictional force along the soil-raft interface. This paper aims to study the behavior and performance of DPR foundation under vertical loading through a parametric study. In this study, three dimensional finite element method (3D FEM) via Plaxis 3D has been employed to model the complex interactions of this DPR taken into account the load transfer in the LTP and along the pile. The analysis consists of the investigation of the effect of dominant parameters such as the area replacement ratio (pile area to mesh soil area), soil and pile stiffness, and the thickness and strength parameters of LTP. Edge effect resulting from the friction between reinforced soil and non-reinforced soil is also investigated. The results from parametric study have shed some light on design optimization.
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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