Urban tunnels often have to intercept or pass under piled foundations of overlying structures.rnPrevious studies on the interaction between piles and tunnelling-induced ground deformations concentrated on the effects of tunnelling on the structural capacity of piles. This paper presents an analytical and explicit solution for evaluating the loss of pile geotechnical capacity due to tunnelling. The method has been derived using the cavity expansion theory. A comparison of the developed method with finite element predictions is given. Parametric studies are carried out in order to investigate the effects of various parameters on the reduction of pile capacity. It is demonstrated that the reduction in geotechnical capacity of piles induced by tunnelling depend strongly on the distance between the pile tip and the tunnel edge, and also the tunnel diameter, volume loss and the pile diameter. Implications of the study on the design of urban tunnels are discussed.
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