Revisiting Broms and Bennermarks’ original stability number for tunnel headings
Article
Article Title | Revisiting Broms and Bennermarks’ original stability number for tunnel headings |
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ERA Journal ID | 200551 |
Article Category | Article |
Authors | Shiau, Jim (Author) and Al-Asadi, Fadhil (Author) |
Journal Title | Geotechnique Letters |
Journal Citation | 8 (4), pp. 310-315 |
Number of Pages | 6 |
Year | 2018 |
Place of Publication | United kingdom |
ISSN | 2045-2543 |
Digital Object Identifier (DOI) | https://doi.org/10.1680/jgele.18.00145 |
Web Address (URL) | https://www.icevirtuallibrary.com/doi/pdf/10.1680/jgele.18.00145 |
Abstract | For undrained clay without volume loss during plastic shearing, stability results are independent of loading directions, and the combination of surcharge, self-weight and internal supporting pressures can produce failure either in collapse or blowout in tunnel stability problems. This paper investigates the use of Broms and Bennermark’s original stability number for tunnel heading problems. The shear strength reduction method is used to obtain rigorous upper bound and lower bound factors of safety for the models under different combinations of pressures. The factor of safety results, which are functions of the stability number and depth ratio, are 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. The charts can also be used to provide an estimation of internal tunnelling pressures, making them useful for designers and practising engineers. |
Keywords | tunnel heading, stability number, factor of safety, shear strength reduction method, design chart |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Civil Engineering and Surveying |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4yyv/revisiting-broms-and-bennermarks-original-stability-number-for-tunnel-headings
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