Determination of critical tunnel heading pressures using stability factors

Shiau, Jim and Al-Asadi, Fadhil (2020) Determination of critical tunnel heading pressures using stability factors. Computers and Geotechnics, 119 (Article 103345). pp. 1-11. ISSN 0266-352X


Abstract

This paper investigates the three-dimensional (3D) stability of a circular tunnel in drained cohesive-frictional soil. Numerical simulations are performed to study the face stability of a circular tunnel for various soil properties and tunnel diameter-to-depth ratios. The finite element limit analysis (FELA) is employed to determine rigorous upper and lower bounds solutions of tunnel stability factors (Fc , Fs and Fy ), which are functions of the depth ratio and soil internal friction angle. These stability factors are used to estimate the critical heading pressures at collapse.The obtained results are compared with existing published solutions in the literature.The study aims to improve the available solutions by using the latest 3D finite element limit analysis technique. A number of examples are provided, which demonstrate the practical use of the three stability factors in estimating tunnel heading pressures.


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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 July 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Date Deposited: 30 Jan 2020 01:00
Last Modified: 07 May 2020 22:57
Uncontrolled Keywords: Upper bound; Lower bound; Finite element limit analysis; Tunnel stability factors
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
12 Built Environment and Design > 1204 Engineering Design > 120499 Engineering Design not elsewhere classified
01 Mathematical Sciences > 0103 Numerical and Computational Mathematics > 010399 Numerical and Computational Mathematics not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi:0.1016/j.compgeo.2019.103345
URI: http://eprints.usq.edu.au/id/eprint/37572

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