Estimation of tunneling induced ground settlement using pressure relaxation method

Shiau, Jim ORCID: https://orcid.org/0000-0002-9220-3184 and Sams, Mathew (2017) Estimation of tunneling induced ground settlement using pressure relaxation method. International Journal of GEOMATE, 13 (39). pp. 132-139. ISSN 2186-2982


Abstract

The prediction of ground settlement caused by tunnelling is frequently estimated using a
specified tunnel volume loss, and by applying a semi-empirical method involving the Gaussian equation, and
relying on engineer's experiences. One of the key parameters in the semi-empirical method, K, is generally
estimated using basic soil classifications, which has the potential to lead to inaccurate judgement from engineers. Better estimation of this constant K has had limited attention by other studies. This research uses a force relaxation technique and the finite difference program, FLAC, to estimate the transverse settlement profile for a range of different scenarios. A number of particular cases are numerically simulated with variation in the factors that influence the tunnel transverse settlement including tunnel depth to diameter ratios (C/D), clay strength ratios (γD/S u ), Young’s Modulus (E), and volume loss (% of tunnel). Using these settlement profiles, a K parameter can be accurately fitted for each case. Results from this study compare favourably with previous empirical and analytical studies. A range of K values is proposed for any combination of soil strength, Young’s Modulus, tunnel geometry, and volume loss.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Date Deposited: 18 Jan 2018 04:29
Last Modified: 13 May 2021 01:58
Uncontrolled Keywords: circular tunnel, settlement, ground movement, undrained clay, FLAC, force relaxation
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400502 Civil geotechnical engineering
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi:10.21660/2017.39.85076
URI: http://eprints.usq.edu.au/id/eprint/33234

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