Three-dimensional heading stability of twin circular tunnels
Article
Article Title | Three-dimensional heading stability of twin circular tunnels |
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ERA Journal ID | 4022 |
Article Category | Article |
Authors | Shiau, Jim (Author) and Al-Asadi, Fadhil (Author) |
Journal Title | Geotechnical and Geological Engineering: an international journal |
Journal Citation | 38 (3), pp. 2973-2988 |
Number of Pages | 16 |
Year | 2020 |
Publisher | Springer |
Place of Publication | Netherlands |
ISSN | 0960-3182 |
1573-1529 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s10706-020-01201-z |
Abstract | This paper investigates the three-dimensional (3D) heading stability of twin circular tunnels horizontally aligned in cohesive undrained clayey soil. The stability is described by Broms and Bennermarks’ undrained stability number, which combine all stresses into a single dimensionless number. A recently developed 3D finite element limit analysis technique is used to obtain rigorous upper bound and lower bound critical stability numbers at collapse and blowout. The interaction effects of the distance between the tunnels on the stability are determined for a series of tunnel cover-to diameter ratios. As an additional verification of the rigorous bounding solutions, the obtained stability results are compared with other published solutions available in the literature. Results from this study are summarized in stability charts and tables for use by designers and practising engineers. |
Keywords | critical supporting pressure, stability number, three-dimensional stability analysis, twin tunnel |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
400504. Construction engineering | |
Byline Affiliations | School of Civil Engineering and Surveying |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5v1v/three-dimensional-heading-stability-of-twin-circular-tunnels
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