We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Undrained stability of dual square tunnels.
- Authors
Wilson, Daniel; Abbo, Andrew; Sloan, Scott; Lyamin, Andrei
- Abstract
In this paper, finite element limit analysis (FELA) and semi-analytical rigid block techniques are used to investigate the influence of tunnel spacing on the undrained stability of two unlined square tunnels constructed side by side. The tunnels, which are assumed to be straight and infinitely long, are modelled under conditions of plane strain. Upper and lower bounds on the stability of the tunnels are obtained using FELA; the numerical formulation of which is based upon the bounds theorems of classical plasticity. These bounds, which bracket the true collapse load from above and below, are found to be in good agreement with one another. Rigid block methods also provided an upper bound estimate on tunnel stability which was generally higher than, but still in good agreement with, the FELA upper bound. Failure mechanisms associated with the collapse of the dual tunnels were investigated, and for deeper tunnels, it was found that mechanisms extend much deeper below the tunnels than the collapse mechanisms associated with a single tunnel. Results from this study are summarised in dimensionless stability charts for use by practitioners.
- Subjects
TUNNEL design &; construction; FINITE element method; MATHEMATICAL bounds; MATERIAL plasticity; NUMERICAL analysis
- Publication
Acta Geotechnica, 2015, Vol 10, Issue 5, p665
- ISSN
1861-1125
- Publication type
Article
- DOI
10.1007/s11440-014-0340-1