Determination of critical tunnel heading pressures using stability factors
Article
Article Title | Determination of critical tunnel heading pressures using stability factors |
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ERA Journal ID | 3466 |
Article Category | Article |
Authors | Shiau, Jim (Author) and Al-Asadi, Fadhil (Author) |
Journal Title | Computers and Geotechnics |
Journal Citation | 119, pp. 1-11 |
Article Number | 103345 |
Number of Pages | 11 |
Year | 2020 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0266-352X |
1873-7633 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compgeo.2019.103345 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0266352X19304094 |
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. |
Keywords | Upper bound; Lower bound; Finite element limit analysis; Tunnel stability factors |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
401001. Engineering design | |
490399. Numerical and computational mathematics not elsewhere classified | |
Byline Affiliations | School of Civil Engineering and Surveying |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5804/determination-of-critical-tunnel-heading-pressures-using-stability-factors
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