CUED Publications database

Imposed longitudinal settlement on a cast-iron tunnel from the excavation of a new tunnel beneath

Alhaddad, M and Wilcock, M and Gue, CY and Elshafie, MZEB and Soga, K and Mair, RJ and Devriendt, M and Wright, P (2018) Imposed longitudinal settlement on a cast-iron tunnel from the excavation of a new tunnel beneath. In: UNSPECIFIED pp. 343-354..

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Abstract

© 2018 Taylor & Francis Group, London. This publication presents observed settlement of an existing cast iron tunnel that was influenced by the excavation of a new tunnel directly beneath and parallel to its axis for more than 100 m. The existing tunnel is 2.7 m in diameter and the new tunnel is up to 11 m in diameter. The clearance between the two was around 2 m. The new excavation took place in two stages; a 6 m diameter pilot tunnel, and a later enlarged to approximately 11 m in diameter. The longitudinal deformation of the existing tunnel due to these two stages was monitored using a newly developed ‘digital image correlation’ technique (CSattAR) and fibre optic sensing cables. This paper focuses on the CSattAR data which show that at subsurface level, the magnitude of the immediate longitudinal ground movement ahead of the tunnelling face in London Clay is likely to be less than empirical assessment methods suggest.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div D > Construction Engineering
Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 04 Mar 2019 23:50
Last Modified: 27 Oct 2020 05:30
DOI: 10.1201/9781315099507-40