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Undrained stability of a square tunnel where the shear strength increases linearly with depth
Abstract This paper investigates the stability of a plane strain square tunnel in undrained clay, where the shear strength profile increases linearly with depth. The stability for a range of tunnel geometries and soil conditions are found using rigid-block upper bound methods as well as finite element limit analysis. The latter procedures employ a discrete form of the bound theorems of classical plasticity, use a bespoke conic programming scheme to solve the resulting optimisation problems, and bracket the true collapse load with upper and lower bound solutions to within 5% for all the cases considered. Results from the parametric study are summarised in the form of stability charts. An approximate closed-form expression is developed for use by practising engineers.
Undrained stability of a square tunnel where the shear strength increases linearly with depth
Abstract This paper investigates the stability of a plane strain square tunnel in undrained clay, where the shear strength profile increases linearly with depth. The stability for a range of tunnel geometries and soil conditions are found using rigid-block upper bound methods as well as finite element limit analysis. The latter procedures employ a discrete form of the bound theorems of classical plasticity, use a bespoke conic programming scheme to solve the resulting optimisation problems, and bracket the true collapse load with upper and lower bound solutions to within 5% for all the cases considered. Results from the parametric study are summarised in the form of stability charts. An approximate closed-form expression is developed for use by practising engineers.
Undrained stability of a square tunnel where the shear strength increases linearly with depth
Wilson, Daniel W. (author) / Abbo, Andrew J. (author) / Sloan, Scott W. (author) / Lyamin, Andrei V. (author)
Computers and Geotechnics ; 49 ; 314-325
2012-09-11
12 pages
Article (Journal)
Electronic Resource
English
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