Three-dimensional heading stability of twin circular tunnels

Shiau, Jim ORCID: https://orcid.org/0000-0002-9220-3184 and Al-Asadi, Fadhil (2020) Three-dimensional heading stability of twin circular tunnels. Geotechnical and Geological Engineering, 38 (3). pp. 2973-2988. ISSN 0960-3182


Abstract

This paper investigates the three-dimensional (3D) heading stability of twin circular tunnels horizontally aligned in cohesive undrained clayey soil. The stability is described by Broms and Bennermarks’ undrained stability number, which combine all stresses into a single dimensionless number. A recently developed 3D finite element limit analysis technique is used to obtain rigorous upper bound and lower bound critical stability numbers at collapse and blowout. The interaction effects of the distance between the tunnels on the stability are determined for a series of tunnel cover-to diameter ratios. As an additional verification of the rigorous bounding solutions, the obtained stability results are compared with other published solutions available in the literature. Results from this study are summarized in stability charts and tables for use by designers and practising engineers.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
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: 09 Jun 2020 05:54
Last Modified: 13 May 2021 01:58
Uncontrolled Keywords: critical supporting pressure, stability number, three-dimensional stability analysis, twin tunnel
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0905 Civil Engineering > 090502 Construction Engineering
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: https://doi.org/10.1007/s10706-020-01201-z
URI: http://eprints.usq.edu.au/id/eprint/38598

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