Experimental investigations of bolted segmental grey cast iron lining behaviour

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Title: Experimental investigations of bolted segmental grey cast iron lining behaviour
Authors: Yu, J
Standing, J
Vollum, R
Potts, D
Burland, J
Item Type: Journal Article
Abstract: The need for the research reported in this paper wa s driven by the Crossrail project in London for which new tunnels were constructed close to numerous existing operational tunnel s of the London Underground (LU ) network. This research component is based on expe rimental work conducted on half - scale grey ca st iron (GCI) tunnel lining segments with chemical composition similar to the Victor ian age GCI segments in the LU network. This paper discusses the deformation behaviour of the bolted segmental lining under the influence of factors such as overburden pre ssure, bolt preload and presence of grommets at small distortions . The measured behaviour of the segmental lining is compared against the calculated response of a continuous lining based on the assumption of elasticity . The industry practice for tunnel li ning assessment is to calculate the induced bending moment in the tunnel lining using an elastic continuum model , while adopting a reduced lining stiffness to take into account the presence of the joints. Case studies have recorded that both loosening and tightening of lining bolts have been used as mitigation measures to reduce the impact of new tunnel excavations on existing GCI tunnels. T he experimental work on the half - scale GCI lining has shown that a bolted segmental lining behaves as a continuous rin g under the small distortion s imposed when subjected to hoop forces relevant to the depth of burial of LU tunnels. In the presence of hoop force, joint opening was minimal and the magnitude of preload in the bolts had little impact on the behaviour of the lining. It is therefore concluded that disturbance of the bolts in existing tunnels is not recommended as a mitigation measure as in addition to being ineffective it is both time consuming and introduces the risk of damaging the tunnel lining flanges.
Issue Date: 24-Oct-2016
Date of Acceptance: 4-Oct-2016
URI: http://hdl.handle.net/10044/1/41229
DOI: https://dx.doi.org/10.1016/j.tust.2016.10.002
ISSN: 0886-7798
Publisher: Elsevier
Start Page: 161
End Page: 178
Journal / Book Title: Tunnelling and Underground Space Technology
Volume: 61
Copyright Statement: Crown Copyright © 2016 Published by Elsevier Ltd. All rights reserved. You may re-use this document/publication (not including logos) free of charge in any format or medium, under the terms of the Open Government Licence v3.0. To view this licence visit http://www.nationalarchives.gov.uk/doc/open-government-licence
Sponsor/Funder: Geotechnical Consulting Group
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: GCG Chair
EP/G063486/1
Keywords: Science & Technology
Technology
Construction & Building Technology
Engineering, Civil
Engineering
Grey cast iron
Tunnel lining behaviour
TUNNEL
Geological & Geomatics Engineering
0905 Civil Engineering
0914 Resources Engineering And Extractive Metallurgy
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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