Stability factors Fc, Fs, and Fγ for twin tunnels in three dimensions
Article
Article Title | Stability factors Fc, Fs, and Fγ for twin tunnels in three dimensions |
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ERA Journal ID | 4202 |
Article Category | Article |
Authors | Shiau, Jim (Author) and Al-Asadi, Fadhil (Author) |
Journal Title | International Journal of Geomechanics |
Journal Citation | 22 (3), pp. 1-8 |
Article Number | 04021290 |
Number of Pages | 8 |
Year | 2022 |
Publisher | American Society of Civil Engineers |
Place of Publication | United States |
ISSN | 1532-3641 |
1943-5622 | |
Digital Object Identifier (DOI) | https://doi.org/10.1061/(ASCE)GM.1943-5622.0002264 |
Web Address (URL) | https://ascelibrary.org/doi/10.1061/%28ASCE%29GM.1943-5622.0002264 |
Abstract | This paper aims to study the three-dimensional (3D) tunnel heading pressure of twin circular tunnels in a drained cohesive–frictional soil using a stability factor approach and finite-element limit analysis (FELA). The primary concept adopted will be the use of a conventional equation that is similar to the traditional bearing capacity factors (e.g., Nc, Ns, and Nγ) in Terzaghi’s bearing capacity equation. For various spacing ratios (S/D) between the tunnels, the stability of the tunnels is expressed in terms of nondimensional tunnel stability factors (e.g., Fc, Fs, and Fγ), which are functions of the depth ratio (C/D) and soil internal friction angle (ϕ). For conciseness, the results will be presented in charts and tables with the tunnel stability factors that used the rigorous FELA upper (UB) and lower bound (LB) solutions. |
Keywords | upper bound; lower bound; three-dimensional finite-element limit analysis; tunnel stability factors; spacing ratio |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | School of Civil Engineering and Surveying |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6yy1/stability-factors-fc-fs-and-f-for-twin-tunnels-in-three-dimensions
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