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| Research on transverse force and deformation of shield tunnels below foundation pits considering influence of longitudinal deformation |
| ZHANG Xinhai1，2，3，WEI Gang1，LIN Xinbei1 |
| (1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；2. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. College of Ocean，Zhejiang University，Zhoushan，Zhejiang 316000，China) |
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Abstract Based on the analysis of confining pressure variation of shield tunnels caused by foundation pit excavation，a model for evaluating the transverse additional confining pressure of shield tunnels，considering the influence of longitudinal deformation，is proposed. A simplified finite element model of shield tunnel segment rings is established for structural calculation and analysis. Taking a underlying shield tunnel of Hangzhou metro line 1 as an example，the calculated values of the horizontal convergence of the tunnel is compared with the measured data to verify the reliability of the calculation method. The confining pressure，the internal force of linings and the relationships of the longitudinal and transverse forces are studied，and the influence of the excavation size of the foundation pit is analyzed. The results prove that the calculated horizontal convergent deformation of the underlying tunnel and its distribution along the tunnel well match the measured values. The unloading effect of the confining pressure caused by excavation mainly affects the top and bottom of the tunnel lining and is affected by the forces between segments in the process of longitudinal deformation. The excavation causes the reverse of the bending moment on the shield tunnel lining and significantly reduces the axial force at the arch waist. The three-dimensional unloading ratio V3D can better reflect the influence of the size of the excavation on the underlying shield tunnel.
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2020, Vol. 39 
