City Research Online

Abstract

The prediction of the excavation-induced displacements by shaft construction in urban areas is an important design issue. A series of experiments were conducted by Le et al. (2019) using a geotechnical centrifuge to evaluate the distribution with depth of soil movements induced during a shaft construction. Those results have been confirmed and expanded in this work by means of numerical analyses. Following this validation, numerical modelling has been used to analyse the influence of OCR and of the shaft geometry, namely its depth H and diameter D!"#$%. In the abovementioned experimental study (Le et al., 2019) the presence of existing underground structures in the proximity of the shaft had been neglected. Therefore, in this study the effect of an existing shallow tunnel in the vicinity of the shaft excavation was taken into account and numerically analysed. The results show that the induced displacement field is affected by the tunnel, depending on its distance from the shaft. Nevertheless, when the distance between the shaft and the existing tunnel is larger than the tunnel axis depth, the tunnel presence may be neglected in the prediction of shaft-indued displacements. Based on the numerical results, further centrifuge tests will be carried out to model the interaction between the shaft excavation and the tunnel.

Publication Type:	Conference or Workshop Item (Paper)
Additional Information:	©2021, the authors.
Publisher Keywords:	ground movements, shaft, tunnel, deep excavation, numerical validation
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology > Engineering

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