CUED Publications database

Multi-suite monitoring of an existing cast iron tunnel subjected to tunnelling-induced ground movements

Alhaddad, M and Wilcock, M and Gue, CY and Bevan, H and Stent, S and Elshafie, MZEB and Soga, K and Devriendt, M and Wright, P and Waterfall, P (2014) Multi-suite monitoring of an existing cast iron tunnel subjected to tunnelling-induced ground movements. In: UNSPECIFIED pp. 293-307..

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The behaviour of existing cast iron tunnels subjected to ground movements induced by new tunnelling works is a much discussed topic. In many cases, new tunnels in highly populated urban cities like London will need to be constructed underneath a dense network of existing tunnels to avoid them. The construction of new tunnels, however, inevitably results in ground deformations that are transmitted to adjacent existing structures. The response of existing cast iron tunnels to tunnelling-induced deformation is not well understood. Practicing engineers are faced with significant uncertainties about their response. This paper presents a case study in which multiple monitoring technologies have been deployed in a section at an existing cast iron tunnel in London underneath which a new, much larger tunnel is being constructed. The new tunnel is being excavated parallel with, and directly below the existing tunnel for a length of approximately 100m. Instrumentation technologies deployed in a 40-m-long section within the 100m zone include analogue linear displacement transducers, fibre optics, digital tilt sensors, video extensometer and digital image correlation, laser scanning and photogrammetry. The multi-technology deployments in this case study are presented in a unified dashboard system specifically developed for this project. They provide an ideal scenario to investigate the detailed cast iron tunnel response using independent data sets. They also provide an exceptional opportunity, within the dashboard system, to use these data sets to understand the capabilities of the associated technologies when compared and contrasted against each other. The dashboard system can provide practicing engineers with the ability to understand tunnels' response accurately and rapidly and, hence, potentially provide significant time and cost savings for complex infrastructure projects. © 2014 American Society of Civil Engineers.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Construction Engineering
Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:06
Last Modified: 22 Oct 2020 05:11
DOI: 10.1061/9780784413449.030