The "convergence-confinement" method takes into account the three dimensional aspect and the indeterminate nature of the problem posed by analysis of tunnel supports. Following a review of the four categories of methods for evaluating the stability of tunnels, the article explains in detail the method used to calculate the pressure to which the tunnel supports or lining are subjected by intersection of two characteristic curves of radial stresses as a function of the radial deformation, one concerning the lining and the other the surrounding terrain. The theoretical span is analysed, then the practical span and the validity of the method is checked. The necessary measurements and their characteristics, which are sometimes contradictory are described and examples of measurement of convergences which are satisfactory for the conditions and which are obtained by a remote radio control measuring device (bored extensometers used by the EDF in the Bellodonne Tunnel) are given. The interpretation of the measurements is analysed (in particular the time function). The article concludes with some information regarding the interaction between measurements and a mechanical model based on (the work of working party n7 of The Association Francaise des Travaux en Souterrain (AFTES) at the specialised technical session of 10th May 1977). (TRRL)

  • Availability:
  • Corporate Authors:

    Centrale des Revues Dunod Gauthier Villars

    B.P. 119
    Montreuil Cedex,   France 
  • Authors:
    • Gesta, P
    • KERISEL, J
    • Londe, P
    • LOUIS, C
    • Panet, M
  • Publication Date: 1979-2


  • French

Media Info

  • Features: Figures;
  • Pagination: p. 17-24
  • Serial:
    • Construction
    • Issue Number: 11
    • Publisher: Reed Construction Data
    • ISSN: 0045-3900

Subject/Index Terms

Filing Info

  • Accession Number: 00315192
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Files: ITRD, TRIS
  • Created Date: Oct 27 1980 12:00AM