Effect of anisotropy in ground movements caused by tunnelling
Name
Zymnis et al - 2013.pdf
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8.22 MB
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Author(s)
Zymnis, Despina Maria
Chatzigiannelis, I.
Whittle, Andrew
Date Issued
June 2013
Journal
Geotechnique
Publisher
Thomas Telford Ltd.
Citation
Zymnis, D.M., A.J. Whittle, and I. Chatzigiannelis. “Effect of Anisotropy in Ground Movements Caused by Tunnelling.” Geotechnique 63, no. 13 (October 1, 2013): 1083–1102.
Version
Author's final manuscript
Abstract
This paper presents closed-form analytical solutions for estimating far-field ground deformations caused by shallow tunnelling in a linear elastic soil mass with cross-anisotropic stiffness properties. The solutions describe two-dimensional ground deformations for uniform convergence (u [subscript ε]) and ovalisation (u [subscript δ]) modes of a circular tunnel cavity, based on the complex formulation of planar elasticity and superposition of fundamental singularity solutions. The analyses are used to interpret measurements of ground deformations caused by open-face shield construction of a Jubilee Line Extension (JLE) tunnel in London Clay at a well-instrumented site in St James's Park. Anisotropic stiffness parameters are estimated from hollow-cylinder tests on intact block samples of London Clay (from the Heathrow Airport Terminal 5 project), and the selection of the two input parameters is based on a least-squares optimisation using measurements of ground deformations. The results show consistent agreement with the measured distributions of surface and subsurface, vertical and horizontal displacement components, and anisotropic stiffness properties appear to have little effect on the pattern of ground movements. The results provide an interesting counterpoint to prior studies using finite-element analyses that have reported difficulties in predicting the distribution of ground movements for the instrumented section of the JLE tunnel.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1680/geot.12.P.056
