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Empirical and semi-analytical methods for evaluating tunnelling-induced ground movements in sands

Franza, Andrea; Marshall, Alec M.

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Authors

Andrea Franza

ALEC MARSHALL alec.marshall@nottingham.ac.uk
Professor of Geotechnical Engineering



Abstract

Empirical formulas and closed-form solutions provide, in many cases, good predictions of tunnelling-induced ground movements which, when combined with their computational efficiency, make them valuable for tunnel-structure interaction analyses. For sandy soils, however, there is a shortage of available methods that can adequately describe the changes in soil deformation patterns that occur as a result of tunnel volume loss, soil relative density, and geometrical parameters. In this paper, two approaches are adopted to describe centrifuge test outcomes for tunnelling in dry silica sand of varying relative density. Firstly, empirical expressions for the prediction of settlement trough shape and magnitude are presented; additionally, a set of equations is given to describe the settlement troughs using modified Gaussian curves. Next, semi-analytical expressions (modifying an elastic analytical solution for incompressible soil and ovalized tunnel) are developed to predict both vertical and horizontal movements within the ground. Results from both methods can capture the main effects that cover-to-diameter ratio, relative density, and volume loss have on surface and subsurface ground movement profiles. The proposed expressions can be used for the calibration/verification of tunnel-structure interaction analysis methods by using outputs from comparable centrifuge tests; once verified, these methods may be more widely applied to other scenarios and used within design or risk-assessment exercises.

Citation

Franza, A., & Marshall, A. M. (2019). Empirical and semi-analytical methods for evaluating tunnelling-induced ground movements in sands. Tunnelling and Underground Space Technology, 88, 47-62. https://doi.org/10.1016/j.tust.2019.02.016

Journal Article Type Article
Acceptance Date Feb 20, 2019
Online Publication Date Mar 8, 2019
Publication Date 2019-06
Deposit Date Feb 20, 2019
Publicly Available Date Mar 8, 2019
Journal Tunelling and Underground Space Technology
Print ISSN 0886-7798
Electronic ISSN 1878-4364
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 88
Pages 47-62
DOI https://doi.org/10.1016/j.tust.2019.02.016
Keywords Tunelling; Gorund movements; Empirical; Analytical; Centrifuge modelling
Public URL https://nottingham-repository.worktribe.com/output/1573800
Publisher URL https://www.sciencedirect.com/science/article/pii/S0886779818310174
Additional Information This article is maintained by: Elsevier; Article Title: Empirical and semi-analytical methods for evaluating tunnelling-induced ground movements in sands; Journal Title: Tunnelling and Underground Space Technology; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.tust.2019.02.016; Content Type: article; Copyright: © 2019 The Authors. Published by Elsevier Ltd.
Contract Date Feb 20, 2019

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