›› 2011, Vol. 32 ›› Issue (S1): 761-0765.

• Numerical Analysis • Previous Articles     Next Articles

Analysis on construction influence of four adjacent and overlapped shield tunnels

LI Peng1, XU Hai-qing2, LI Zhen-wei3   

  1. 1. Wuhan University of Technology; Wuhan 430070, China; 2. Wuhan Metro Group Co. Ltd., Wuhan 430030, China; 3. Beijing Urban Engineering Design & Research Institute Co. Ltd., Beijing 100037, China
  • Received:2010-11-15 Online:2011-05-15 Published:2011-05-16

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Abstract: Adjacent overlap multi tunnels are a complex spatial distribution form with the unceasing development of the metro construction. Relying on the project of Wuhan metro line 2 and line 4, for four adjacent and overlapped shield tunnels, 3D FEM is applied to analyzed the ground deformation law caused by dynamic construction of tunnel and the influence of latter tunnel excavation on former tunnel. The results show that the buried depth has a remarkable effect on the ground deformation; the final deformation caused by the construction is 32 mm, which beyonds the standard limits; the larger the buried depth is, the smaller the ground deformation is, but the larger the influence range is; for the ground deformation, the influence range to the ahead is 30 metres, to the back is 25 metres, and the influence range to the transverse for each side is 30 metres; for the tunnel deformation, the top and the bottom are compressed, the left and the right are outward-spread, so the tunnel changes into a inverted duck egg; the tunnel deformation occurs mainly near the cutter of the shield machine, whose range is around 1D, and it becomes steady quickly; the tunnel settlement mainly depends on the construction of the tunnel itself and the vertical tunnel, the construction of adjacent tunnel has major effect on the lateral displacement; the latter tunnel excavation has a great influence on the force of the former tunnel. The research results can provide some references and guidance for Wuhan metro and similar projects in the future.

Key words: Adjacent overlap multi-tunnels, construction, surface deformation

CLC Number: 

  • TU 921
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