Abstract
Surface subsidence control during tunnelling in urban areas is required to minimize any disturbance to nearby buildings and services. The main focus of previous studies concerning surface subsidence was basically on empirical solutions derived from field research. The number of analytical studies which have been carried out is not enough because they do not consider complex ground conditions; hence, it is required to model the effect of surface subsidence caused by tunnelling based on comprehensive analytical solution combined with numerical modelling. This paper presents the results of tunneling-induced surface settlement modelling based on finite element method. The effect of the overconsolidation ratio of soils expressed in terms of the coefficient of earth pressure at rest (K0) on surface subsidence caused by tunnelling is investigated. It is demonstrated that value of K0 is an essential factor affecting accuracy of consolidation settlement estimate in overconsolidated clays.
Highlights
Ground surface settlement caused by tunnelling in soft ground is one of the basic issues in all aspects of tunnel design
To provide a tool to improve the state-of-the-practice of controlling ground movements associated with tunnelling, this paper presents a numerical procedure for tunnelling that effectively and efficiently updates design predictions of surface settlements during construction
Summary The surface settlements appear to be sensitive to the K0-value
Summary
Ground surface settlement caused by tunnelling in soft ground is one of the basic issues in all aspects of tunnel design. To control the effects of deformation various field studies and experiences are carried out, empirical and numeric methods are developed. They are effective for the study of tunnels excavated in grounds that can be modelled as continuous media, with due account of nonlinear behaviours, as well as complex staging and geometrical conditions.
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