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| Discussion on Calculation Model for Lining Structure of Shield Tunnel |
| DAI Zhi-ren |
| China Railway First Survey and Design Institute Group Co. Ltd, Shaanxi, Xi'an 710043, China |
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Abstract Research purposes：The compression spring calculation mode is commonly used for the arch bottom of the shield tunnel, but it lacks the theoretical support. The internal forces and the settlement deformation trend obtained with this model are less than and inconsistent with the real situation so as to make the safety factor over lower. In order to enforce the reliability and accuracy of lining structure design，the comparison and analysis of different calculation models are carried out，the fundamental reason for wide application of the compression spring calculation model is put foreward， and the reasonable calculation model is presented.
Research conclusions：(1 )The reaction force form of the foundation of the arch bottom of the tunnel is closely related to the displacement trend. When the arch bottom raises and deforms, the reacting force of the foundation is only composed of the counterforce，but when the arch bottom compressedly deforms，the reacting force is composed of the counterforce and the compression resistance of the foundation. (2 ) For the shield tunnel，the lining structure calculation model of reacting force on the arch bottom should be used and it can precisely reflect the load bearing characteristics and displacement trend，and overcome the security risk due to the insufficient safety factor. (3) The form of the reacting force on the arch bottom based on the displacement trend and the corresponding calculation model are put forward. (4) This research result can be applied in the shield tunneling project, mining project and open excavation subway station or subsurface excavation subway station.
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Received: 13 October 2012
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2013, Vol. 30 
