CUED Publications database

Three-dimensional finite element analysis of the behaviour of cross passage between cast-iron tunnels

Li, Z and Soga, K and Wright, P (2016) Three-dimensional finite element analysis of the behaviour of cross passage between cast-iron tunnels. Canadian Geotechnical Journal, 53. pp. 930-945. ISSN 0008-3674

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© 2016, National Research Council of Canada. All rights reserved. The behaviour of cast-iron cross passages in the London Underground was investigated using three-dimensional finite element models. Unlike the behaviour of a full tunnel ring, the structural integrity of a tunnel cross-passage opening relies on support from adjacent linings. In clayey soils, the opening may deform further as the soil stiffness changes from undrained to drained conditions. Degradation of the circumferential bolts and trackbed may also lead to further tunnel movement. A parametric study was conducted to examine the influence of soil stiffness and structural components (e.g., bolts and lintel) on the structural integrity of a tunnel opening. Results show that a lintel effectively transfers the load above the opening to the adjacent linings, and its distortion affects tunnel deformation significantly. If a lintel is not present, both bolts and friction between tunnel segments provide shear resistance to the lining deformation at the tunnel opening against soil loading. Results are compared with field observations made at a critical cross passage in one of the London Underground tunnels. The findings contributed to identifying the critical deformation mechanisms of cast-iron tunnel cross passages, which can be useful during inspection of such structures.

Item Type: Article
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:34
Last Modified: 27 Oct 2020 06:26
DOI: 10.1139/cgj-2015-0273