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Measured short-term subsurface ground displacements from EPBM tunnelling in London Clay

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Title: Measured short-term subsurface ground displacements from EPBM tunnelling in London Clay
Authors: Wan, MSP
Standing, JR
Potts, DM
Burland, JB
Zdravkovic, L
Item Type: Journal Article
Abstract: Subsurface ground displacements from the construction of the twin-bore Crossrail tunnels in London Clay by earth pressure balance machines (EPBMs) are presented and discussed, complementing a companion paper by the authors that focused on the surface response. Both papers report vertical and horizontal displacements, in this case measured using comprehensive arrays of instruments installed within boreholes in Hyde Park, London. The Crossrail tunnels are deeper than those cited in most UK case histories concerning tunnelling in stiff clay. Clear insights were gained into subsurface displacement mechanisms: an ‘inward’ displacement field was observed around the Crossrail tunnel construction, in contrast to the ‘outward’ displacement field that developed around the shallower Channel Tunnel Rail Link tunnels constructed east of London using similar EPBMs in London Clay. This has important implications when estimating subsurface displacements using currently available empirical methods. Appraisal of the EPBM operational variables suggests that the relative magnitude of face and tail grout pressures to overburden stress is the key factor contributing to the opposing senses of the observed displacement fields. Earlier tunnelling-induced strain softening of the London Clay is evident from greater subsurface incremental volume losses and settlement trough width parameters relating to subsequent tunnel construction.
Issue Date: 11-Jan-2018
Date of Acceptance: 13-Jun-2017
URI: http://hdl.handle.net/10044/1/49188
DOI: 10.1680/tue.63778.005
ISSN: 0016-8505
Publisher: ICE Publishing
Start Page: 748
End Page: 779
Journal / Book Title: Geotechnique: international journal of soil mechanics
Volume: 67
Issue: 9
Copyright Statement: © ICE Publishing, all rights reserved. Published with permission by the ICE under the CC-BY 4.0 license. (http://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Geotechnical Consulting Group
Geotechnical Consulting Group LLP
Funder's Grant Number: EP/G063486/1
GCG Chair
Keywords: Science & Technology
Engineering, Geological
field instrumentation
ground movements
Geological & Geomatics Engineering
0905 Civil Engineering
0907 Environmental Engineering
0914 Resources Engineering and Extractive Metallurgy
Publication Status: Published
Online Publication Date: 2017-07-18
Appears in Collections:Civil and Environmental Engineering
Faculty of Engineering

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