Behaviour of buildings due to tunnel induced subsidence

[giguni]

Behaviour of buildings due to tunnel induced subsidence

In urban areas tunnelling can induce ground movements which distort and, in severe cases damage overlying buildings and services. The conventional design methods, used in engineering practice to assess these deformations, are based on empiricism gained from green field sites and consequently do not account for important characteristics of these structures. Furthermore the mechanisms which control this tunnel-soil-structure interaction problem arenot well understood. Recently, a new approach, based on the relative stiffness of a building and the underlying soil, has been proposed to account for the effect of a building stiffness when predicting its deformation and potential damage. The objective of this thesis is to assess this new approach and extend its applicability. This has been achieved by performing parametric studies using both two and three dimensional fnite element analyses and by reviewing field data obtained during the construction of the Jubilee Line Extension. In particular the e®ect of building weight, the nature of the contact between the building foundations and the soil and the geometry of the building with respect to the direction of tunnelling on the behaviour of the building has been investigated. The results of these investigations have lead to an improved understanding of the tunnel-soil-building interaction problem. They have also verified and extended the applicability of the relative sti®ness approach providing greater confidence for its use in engineering practice.

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[JUANCM]

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[3fan]

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