Imperial College London
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Emeritus ProfessorJohnBurland

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Research Investigator
 
 
 
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Contact

 

j.burland

 
 
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Location

 

416Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wan:2017:10.1680/jgeot.16.P.099,
author = {Wan, MSP and Standing, JR and Potts, DM and Burland, JB},
doi = {10.1680/jgeot.16.P.099},
journal = {Géotechnique},
pages = {420--445},
title = {Measured short-term ground surface response to EPBM tunnelling in London Clay},
url = {http://dx.doi.org/10.1680/jgeot.16.P.099},
volume = {67},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Earth-pressure-balance machines (EPBMs) were used for the construction of Crossrail tunnels in London, providing opportunities for field investigation of consequent ground response. Analysed results from an instrumented research site in Hyde Park with extensive surface and subsurface monitoring arrays are presented and discussed. The Crossrail tunnels at the site are 34·5 m below ground, deeper than those in most case histories of tunnelling in stiff clay in the UK. This paper characterises the tunnelling-induced ground response, both ‘greenfield’ and in the proximity of the existing Central Line tunnels, dealing with measurements at the ground surface. A companion paper covers the subsurface ground response. Vertical and horizontal ground surface displacements were obtained from manual precise levelling and micrometer stick measurements. Several key findings will benefit future tunnelling projects involving EPBMs. Volume loss values measured at the instrumented site were low, being less than 0·8% and 1·4% for the first and second tunnel drives respectively, higher values being associated with ground softening from the first tunnel construction. Smaller volume losses were recorded in the vicinity of the existing Central Line tunnels, compared with the greenfield location, suggesting that their presence inhibited the development of ground movements. Asymmetric settlement troughs developed due to either the nearby pre-existing tunnels or the construction of the first tunnel. Marginally smaller values of trough width parameter, Ky, were determined for these deeper tunnels compared with previous greenfield ground case histories. Resultant vectors of ground surface displacement were directed to well-defined point-sinks above the tunnel axis level.
AU  - Wan,MSP
AU  - Standing,JR
AU  - Potts,DM
AU  - Burland,JB
DO  - 10.1680/jgeot.16.P.099
EP  - 445
PY  - 2017///
SN  - 0016-8505
SP  - 420
TI  - Measured short-term ground surface response to EPBM tunnelling in London Clay
T2  - Géotechnique
UR  - http://dx.doi.org/10.1680/jgeot.16.P.099
UR  - http://hdl.handle.net/10044/1/43167
VL  - 67
ER  -
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