Revisiting Circular Tunnel Stability Using Broms and Bennermarks’ Original Stability Number

Shiau, Jim ORCID: https://orcid.org/0000-0002-9220-3184 and Al-Asadi, Fadhil (2021) Revisiting Circular Tunnel Stability Using Broms and Bennermarks’ Original Stability Number. International Journal of Geomechanics, 21 (5):06021009. pp. 1-9. ISSN 1532-3641


Abstract

The stability of a single circular tunnel in cohesive undrained soil was investigated under plain strain conditions using a two-dimensional finite-element limit analysis (FELA) program and a shear strength reduction method (SSRM). The stability for this problem was well expressed by using Broms and Bennermarks’ original stability number (N = (σs + γH − σt)/Su) owing to the undrained loading conditions. The variations of the factor of safety and the critical stability number were presented for a series of tunnel cover-to-diameter ratios (C/D) in both collapse and blowout scenarios. Also, the extent of surface failure for some selected depth ratios was determined in the case of tunnel collapse. The obtained results were compared and validated by using the finite-difference method, as well as other existing solutions available in the literature. The dimensionless ratios employed in this study make the design charts suitable to cover a broad range of tunnel geometries and soil parameters.


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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: 14 Mar 2021 23:40
Last Modified: 25 Oct 2021 23:08
Uncontrolled Keywords: Stability number; Factor of safety; Shear strength reduction method
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
01 Mathematical Sciences > 0103 Numerical and Computational Mathematics > 010301 Numerical Analysis
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
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
12 CONSTRUCTION > 1202 Construction design > 120201 Civil construction design
Identification Number or DOI: https://doi.org/10.1061/(ASCE)GM.1943-5622.0001996
URI: http://eprints.usq.edu.au/id/eprint/41555

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