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

dc.check.date2019-09-28
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
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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