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

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Li, Z 
Soga, K 
Wright, P 

jats:p 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. </jats:p>

cast iron lining, cross-passage tunnel, bolt-spring model, lintel, bolts
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Canadian Geotechnical Journal
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Canadian Science Publishing
Engineering and Physical Sciences Research Council (EP/I019308/1)
Engineering and Physical Sciences Research Council (EP/K000314/1)
Engineering and Physical Sciences Research Council (EP/L010917/1)
This work was supported by National Basic Research Program of China (973 Program: 2011CB013800), National Natural Science Foundation of China (No. 51508403) and the Cambridge Trust scholarship. The authors would like to thank London Underground Limited for providing invaluable the photos and support.