This work deals with the stability of tunnels which have been constructed by the "new Austrian tunnelling method" and were not driven through stable rock. In such projects the safety margin, when defined in an analogous fashion with the usual safety definitions, is considerably narrower. This is particularly noticeable in the construction of the tunnel lining. Each element of the lining is stressed over its capacity, so that the entire composite system is in a failure-plastic condition. This applies until the stress redistribution introduces a state of equilibrium, in which case the safety factor amounts to 1.0. In order to be able to estimate the safety factor for a tunnel lining, it is necessary to narrow the range of scatter of the various parameters in addition to determining the rock mechanics properties from numerous tests. The inner ring increases the safety to a satisfactory figure and generally takes no loading. Experience in the Tauern and Arlberg tunnels has demonstrated that in the case of an unfavourable change in the parameters subsequent loading can occur. /TRRL/

  • Corporate Authors:

    Forschungsgesellschaft Strassenwesen in Oeiav

    Eschenbachgasse 9
    A-1010 Vienna,   Austria 
  • Authors:
    • Seeber, G
  • Publication Date: 0


  • German

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 17-22
  • Serial:
    • Schriftenreihe FGS
    • Issue Number: 67
    • Publisher: Forschungsgesellschaft Strassenwesen in Oeiav

Subject/Index Terms

Filing Info

  • Accession Number: 00189511
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM