Estimation of tunneling induced ground settlement using pressure relaxation method

Shiau, Jim 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 / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 18 Jan 2018 04:29
Last Modified: 18 Jan 2018 04:29
Uncontrolled Keywords: circular tunnel, settlement, ground movement, undrained clay, FLAC, force relaxation
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
Socio-Economic Objective: 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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