THE EXPANSION PROCESS IN THE FORMATION OF SWISS RAILWAY TUNNELS

SCHWELLVORGAENGE IM PLANUM SCHWEIZERISCHER BAHNTUNNELS

In the previous century and again at the turn of the century numerous railway tunnels had to be repaired, even during the construction period. By far the greatest part of the damage occurred as a result of the expansion of the formation of flat tunnel inverts. In a series of Swiss railway tunnels it was possible to measure the rising of the invert as a result of expansion by between 0.1 and 1.5 cm per year. The expansion process appears in stretches of tunnels having rock with a clay and/or anhydrite content. From various calculations, investigations and considerations it is possible to recognise the expansion process in these rocks as a consequence of the creation of a condition for discharge into the voids beneath the flat invert area. By means of laboratory tests various qualities relative to the absorbent capacities of these rocks have been identified. Nevertheless the movement and origin of water in the rocks cannot be reproduced in the laboratory. As part of the maintenance work of the last few years new invert linings have been constructed in various tunnel installations. By this means the expansion area can be immediately reduced, since the residual expansion is taken up by the invert lining. The solving of the problem in existing tunnels represents a compromise. For new tunnels a circular, elliptic or parabolic form for the excavation of the invert should represent a more positive solution.

  • Availability:
  • Corporate Authors:

    Springer Verlag

    175 5th Avenue
    New York, NY  United States  10010
  • Authors:
    • Golta, A
  • Publication Date: 1976

Language

  • German

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 231-243
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00309934
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • ISBN: 3-211-81384-5
  • Files: ITRD, TRIS
  • Created Date: May 7 1980 12:00AM