Tunnelling close beneath an existing tunnel in clay – perpendicular undercrossing
Gue, Chang Ye
Alhaddad, Mohammed Mehdi
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Gue, C. Y., Wilcock, M., Alhaddad, M. M., Elshafie, M., Soga, K., & Mair, R. (2017). Tunnelling close beneath an existing tunnel in clay – perpendicular undercrossing. Géotechnique, 67 (9), 795-807. https://doi.org/10.1680/jgeot.SiP17.P.117
A series of centrifuge model tests in clay was carried out to investigate the response of an existing tunnel at different clear distances to new tunnelling. A three-dimensional (3D) staged tunnelling model was adopted to simulate a wide range of tail void volume losses for the new tunnel construction while monitoring detailed 3D soil surface settlements and tunnelling-induced strains in the existing tunnel lining. This paper also presents a detailed case study of a similar scenario in the London Underground redevelopment of Bond Street station; various state-of-the-art instrumentation methods, including fibre optic Brillouin optical time domain reflectometry, instrumented tunnel bolts and photogrammetry, were deployed to monitor the response of the existing Royal Mail tunnel due to the new tunnelling works close beneath. The combination of field and centrifuge modelling data provides important new insights into the deformation mechanisms encountered in such complex tunnelling scenarios.
centrifuge modelling, field instrumentation, tunnels & tunnelling
This research would not have been possible without financial support from Laing O'Rourke plc for the first author's PhD studentship. The authors would also like to acknowledge the logistical and technical support provided by London Underground, Royal Mail Group Ltd, CH2M Hill and the Schofield Centre technicians and the continuous support from the UK Engineering and Physical Sciences Research Council (EPSRC) and Innovate UK through their funding of the Cambridge Centre for Smart Infrastructure and Construction (CSIC).
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External DOI: https://doi.org/10.1680/jgeot.SiP17.P.117
This record's URL: https://www.repository.cam.ac.uk/handle/1810/265004
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/