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Low-volume-loss tunnelling for London ring main extension

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Jones, Benoît. (2010) Low-volume-loss tunnelling for London ring main extension. Proceedings of the ICE - Geotechnical Engineering, Vol.163 (No.3). pp. 167-185. ISSN 1353-2618

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Official URL: http://dx.doi.org/10.1680/geng.2010.163.3.167

Abstract

The Thames Water ring main extension is a 4.5 km long tunnel from Stoke Newington, in the London borough of Hackney, to New River Head in Finsbury, in the London borough of Islington. The 2.85 m i.d. tunnel was excavated by an earth pressure balance tunnel-boring machine (TBM) at depths between 40 and 60 m below the surface. Surface settlements along the route were measured by precise levelling, and were found to be small. It was therefore even more important to measure these settlements as accurately as possible, in order to provide informed estimates of subsurface movements induced in third-party underground structures much closer to the tunnel horizon. Because of the relatively large magnitude of the background movements measured, when compared with the small tunnel-induced settlements, it was necessary to adopt a rigorous statistical method to fit a Gaussian curve to the data. This exploited the analogy of the ‘error function' to define the Gaussian curve parameters i and V l. In all, 13 tunnels were underpassed successfully by the TBM, all within the ‘conservative expected value' predictions, and without incident. The predictions and structural monitoring schemes undertaken for the High Speed 1 tunnels near Corsica Street and the Northern line tunnels near Angel station are described in the paper. It was found that the surface and subsurface trough width parameter K did not vary with depth as predicted: therefore a new relationship is proposed.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Water-supply engineering -- England -- London, Tunneling -- England -- London, Tunneling -- Mathematical models
Journal or Publication Title:	Proceedings of the ICE - Geotechnical Engineering
Publisher:	ICE Publishing Ltd.
ISSN:	1353-2618
Date:	2010
Volume:	Vol.163
Number:	No.3
Number of Pages:	19
Page Range:	pp. 167-185
Identification Number:	10.1680/geng.2010.163.3.167
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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URI:	http://wrap.warwick.ac.uk/id/eprint/40545