Stability chart for unsupported square tunnels in homogeneous undrained clay

Shiau, Jim ORCID: https://orcid.org/0000-0002-9220-3184 and Mirza Hassan, Mohammad and Hossain, Zakaria (2018) Stability chart for unsupported square tunnels in homogeneous undrained clay. International Journal of GEOMATE, 15 (48). pp. 195-201. ISSN 2186-2982


Abstract

This short technical note investigates the stability of a plane strain square tunnel in homogeneous undrained clay using shear strength reduction technique. The finite difference program FLAC is used to determine the factor of safety for unsupported square tunnels where an automatic generation of program script is developed using FISH programming. This developed procedure enables parametric studies to be conducted in an effective way with great efficiency. Numerical results, expressed in term of factor of safety, are compared with published classical upper and lower bound limit solutions. The comparison between these two numerical methods finds a very good agreement and the confidence level of the current FLAC model has increased significantly. With the success of model validations, a number of stability design charts for square tunnels using dimensionless ratios are presented for practical scenarios in a similar way to Taylor's slope stability charts. Examples are illustrated to show the potential usefulness of the produced design charts for practicing engineers.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Date Deposited: 15 Oct 2021 05:04
Last Modified: 08 Sep 2022 05:26
Uncontrolled Keywords: square tunnel; undrained clay; stability; strength reduction method; design chart
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
Identification Number or DOI: doi:10.21660/2018.48.74149
URI: http://eprints.usq.edu.au/id/eprint/43766

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