This paper discusses tunnel excavation with a tunnel boring machine (TBM), using yielding segmental linings, as a method appropriate for handling the high overburden pressures expected in Alpine tunnelling. In tunnels under the Alps, enormous rock stresses and water pressure must be considered, but the tunnel support can stabilise the excavated cavity because of the rock mass's self-supporting capacity. New developments in tunnel lining must accommodate deformations, to guarantee tunnel stability, and the TBM requires this capability to avoid being stuck. Waterproofing gaskets must be adapted to the changed conditions, to provide a dry tunnel. The European Union's Eureka Contun Project EU 1079 has been set up to develop such deformable linings and TBMs, and a suitable sealing system. The project will design and develop deformable shields with a variable cutterhead diameter, deformable single pass linings, and the gaskets. The project's theoretical phase will define the targets of its development phase in which principles and mathematical models will be formulated for the mechanics of rock masses under high overburden, allowing for time-dependent stiffness and deformation behaviour. Two approaches are being considered, that alone or together allow deformation of a tunnel supported by stiff precast concrete segments.

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  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
  • Publication Date: 1996-5


  • English

Media Info

  • Features: References;
  • Pagination: p. 41-3
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00726615
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Oct 28 1996 12:00AM