Stratum Deformation Analysis and Excavation Sequence Optimization for Four-Line Parallel Shield Tunnels
Authors
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College of Management Science and Engineering, Guangxi University of Finance and Economics, Nanning 530003 ,CN
Yingchun Tang
Keywords:
Four-Line Parallel, Shield Tunnel, Soil Deformation, Excavation Sequence, Finite Element Analysis.Abstract
The multi-line parallel tunnels belong to a complex layout in the underground space that has emerged in the wake of the continuous development of metro construction. When a new tunnel that travels through the existing ones in parallel with over a long distance is constructed, not only an adverse impact will produce on existing parallel tunnels, but also surface subsidence will be occurred. Contrapose the construction pattern that four-line parallel shield tunnels breakthrough soft soil stratum, a 3D elastic-plastic finite element dynamic model is built to simulate and analyze the whole process of four-line parallel shield construction. Study shows that, in the process of shield excavation, the interactive effects between horizontal lines are relatively weak, but in the vertical direction, it presents more intense; after the completion of the excavation for four-line parallel tunnels, the surface subsiders are not symmetrical, but appear right above the last excavation line; first excavation should run from the upper tunnels, followed by the lower tunnels, since it is conducive to the surface settlement control and reducing the interactive effects between various lines. In this paper, the findings can provide a theoretical basis and prophase guidance for such construction in the future.
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