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  • 标题:Research on Spacing Effect of The Construction of Shield Tunnels undercrossed Existing Tunnels at Close Distance
  • 作者:Fan Yang ; Junyan Liu ; Yan Liu
  • 期刊名称:IOP Conference Series: Earth and Environmental Science
  • 印刷版ISSN:1755-1307
  • 电子版ISSN:1755-1315
  • 出版年度:2018
  • 卷号:189
  • 期号:2
  • 页码:022086
  • DOI:10.1088/1755-1315/189/2/022086
  • 语种:English
  • 出版社:IOP Publishing
  • 摘要:With the increasingly dense distribution of urban subway network, line crossing will inevitably occur. The phenomenon of new tunnels passing through existing tunnels is becoming more and more common. Shield tunneling will inevitably disturb the surrounding soil and redistribute the stress and displacement fields, resulting in the deformation and additional stress of existing subway tunnels. The new tunnel should have strict requirements for the deformation control of existing tunnels and surrounding rocks. The spacing effect of new tunnels under existing tunnels can ensure the safety of new tunnels and the operation safety of existing shield tunnels, which has become an important problem to be solved urgently. On the basis of theoretical analysis, this paper takes a new shield tunnel under the existing tunnel in Xuzhou City as the backing, carries out numerical simulation of the new and old tunnel under different clearance by finite element software, and studies the influence of the new tunnel on the existing tunnel when the tunnel is constructed with different spacing of 1.5m, 0.5D, 1D, 1.5D, 2D and 3D. It is concluded that the reasonable distance between the new tunnel and the existing tunnel should be controlled between 1D and 1.5D under the circumstance of the surrounding environment, the permission of the new tunnel line and the economical and reasonable conditions.
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