The effects of boring a new tunnel under an existing masonry tunnel

A 3 metre diameter tunnel bored in London Clay passed under a cut and cover, brick arch tunnel constructed in 1863. The existing tunnel carries the Metropolitan Line railway under the heavily trafficked Euston Road and has an 8.7m span. The new tunnel was formed using a TBM, but some deformation of the surrounding soil was inevitable. Investigations and analysis showed that deformation would not prejudice the safety of the existing tunnel. Real-time instrumentation and surveys measured movements in close approximation to the predicted behaviour.

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Publication Details

Published
2026-02-24
DOI
https://doi.org/10.1201/9781003761952-45
Citations
2
Primary Topic
Geotechnical Engineering and Analysis
Type
article
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article

The effects of boring a new tunnel under an existing masonry tunnel

YC Lu, H Samuel, T. I . Addenbrooke, Ilj Chudleigh et al.
2 citations
Geotechnical Engineering and Analysis
article

The effects of boring a new tunnel under an existing masonry tunnel

YC Lu, H Samuel, T. I . Addenbrooke, Ilj Chudleigh, P Readings, RJ Mair
article en
2 citations

Abstract

A 3 metre diameter tunnel bored in London Clay passed under a cut and cover, brick arch tunnel constructed in 1863. The existing tunnel carries the Metropolitan Line railway under the heavily trafficked Euston Road and has an 8.7m span. The new tunnel was formed using a TBM, but some deformation of the surrounding soil was inevitable. Investigations and analysis showed that deformation would not prejudice the safety of the existing tunnel. Real-time instrumentation and surveys measured movements in close approximation to the predicted behaviour.

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The effects of boring a new tunnel under an existing masonry tunnel — YC Lu, H Samuel, et al. · (2026) | TGRS Research Map | TGRS