Distributed fibre optic sensing of a deep excavation adjacent to pre-existing tunnels

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dc.contributor.authorLi, Zili
dc.contributor.authorSoga, Kenichi
dc.contributor.authorKechavarzi, Cedric
dc.contributor.funderEngineering and Physical Sciences Research Councilen
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.date.accessioned2019-05-02T12:01:22Z
dc.date.available2019-05-02T12:01:22Z
dc.date.issued2018-09-28
dc.date.updated2019-05-02T11:46:32Z
dc.description.abstractThis research study investigated diaphragm wall (D-wall) behaviour due to deep excavation at Paddington tunnel station site in London Clay. The Paddington site was the only train station in the Crossrail project constructed using a top-down excavation, and it provided the opportunity to evaluate the effect of a pre-existing tunnel on D-wall behaviour using distributed fibre optic sensing (DFOS) for the first time. Distributed fibre optic cables were embedded in the D-wall panels to monitor the changes in strain conditions during three key stages of construction; tunnel passage, concourse excavation and base excavation. After station construction, relevant finite element (FE) analysis was conducted to evaluate the D-wall performance during excavation, and the computed results were compared against the field measurements recorded by embedded DFOS in the D-wall as well as the ground inclinometers. The DFOS measurements depicted the D-wall behaviour in agreement with the conventional inclinometer method and FE results, demonstrating its feasibility in monitoring underground earth retaining infrastructure. A comparison between the D-wall behaviour with pre-existing tunnels at Paddington site and that of the same wall without tunnels allows providing some guidance for the design and construction of retaining structures adjacent to pre-existing tunnels.en
dc.description.sponsorshipEngineering and Physical Sciences Research Council (Innovation and Knowledge Centre for Smart Infrastructure and Construction Collaborative Programme); National Natural Science Foundation of China (Grant Numbers 5170080836, 51608539 and 51508403)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationLi, Z., Soga, K. and Kechavarzi, C. (2018) 'Distributed fibre optic sensing of a deep excavation adjacent to pre-existing tunnels', Géotechnique Letters, 8(3), pp. 171-177. doi: 10.1680/jgele.18.00031en
dc.identifier.doi10.1680/jgele.18.00031en
dc.identifier.eissn2045-2543
dc.identifier.endpage177en
dc.identifier.issued3en
dc.identifier.journaltitleGéotechnique Lettersen
dc.identifier.startpage171en
dc.identifier.urihttps://hdl.handle.net/10468/7837
dc.identifier.volume8en
dc.language.isoenen
dc.publisherICE Publishingen
dc.relation.urihttps://www.icevirtuallibrary.com/doi/abs/10.1680/jgele.18.00031
dc.rights© 2018, ICE Publishing. All rights reserved. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Géotechnique Letters 8(3), pp. 171-177. To access the final edited and published work see https://doi.org/10.1680/jgele.18.00031en
dc.subjectField instrumentationen
dc.subjectTunnelsen
dc.subjectTunnellingen
dc.subjectWall-tunnel interactionen
dc.subjectTop-down excavationen
dc.subjectPre-existing tunnelen
dc.subjectDistributed fibre optic sensingen
dc.subjectDiaphragm wallen
dc.titleDistributed fibre optic sensing of a deep excavation adjacent to pre-existing tunnelsen
dc.typeArticle (peer-reviewed)en
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