CUED Publications database

Strain monitoring using embedded distributed fibre optic sensors in a sprayed concrete tunnel lining during the excavation of cross-passages

De Battista, N and Elshafie, M and Soga, K and Williamson, M and Hazelden, G and Hsu, YS (2015) Strain monitoring using embedded distributed fibre optic sensors in a sprayed concrete tunnel lining during the excavation of cross-passages. In: UNSPECIFIED.

Full text not available from this repository.

Abstract

© 2015, International Society for Structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved. The Crossrail project is currently the largest construction undertaking in Europe. It includes ten new rail stations, six of which are under central London, and 42 km of new rail tunnels weaving through the U.K. capital city's congested sub-terrain. The underground stations typically consist of a concourse tunnel in between two platform tunnels, all linked with a number of cross-passages. The station tunnels are constructed using sprayed concrete lining (SCL) techniques. A distributed fibre optic sensor system was embedded within the SCL at Crossrail's Liverpool Street Station to monitor the changes in strain within the tunnel lining, during the excavation of cross-passages. The monitoring system provided, for the first time ever, continuous strain profiles in the SCL during each stage of the cross-passage excavation. This field data is useful for calibrating SCL design models which, so far, have been purely analytical. The maximum recorded changes in tangential strains were 820 με in hoop compression and 567 με in longitudinal tension. The strain profiles indicate that the area of tunnel lining affected to any significant amount by the cross-passage excavation, is considerably smaller than the extent of the thickening SCL.

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: 17 Jul 2017 19:43
Last Modified: 15 Aug 2017 01:26
DOI: