Research on Construction Disturbance Caused by Multi-Line Overlapped Shield Perpendicularly Crossing

With the unceasing development of metro construction, multi-line overlapped shield tunnels in soft soil are being built as a complex spatial distribution. When the existing tunnel is traversed by a new one, the construction will result in ground settlement and, meanwhile, will exert an adverse effect on the existing tunnel. For two kinds of typical construction methods of up-crossing and under-crossing, 3D-elastoplastic FEM was applied to analyze the dynamic construction process. A modified Gaussian Equation was proposed to predict ground settlement according to some parts of the results. The results show that, when the interval among all tunnels is in the influenced range, a secondary disturbance is to be caused by shield advance and greater influence will be exercised on the existing tunnel. During the construction of up-crossing, ground settlement turns to be larger, and the existing tunnel has a tendency of upward moving. But under-crossing leads to a smaller settlement with a tendency of subsidence. The research results can provide a theoretical basis and prophase guidance for similar projects in the future.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 502-513
  • Monograph Title: Tunneling and Underground Construction

Subject/Index Terms

Filing Info

  • Accession Number: 01531616
  • Record Type: Publication
  • ISBN: 9780784413449
  • Files: TRIS, ASCE
  • Created Date: May 22 2014 3:05PM