Preliminary geological and seismological investigations showed the presence of large quantities of water, which might lead to considerable difficulties. In addition, loose material of volcanic origin, was encountered over a distance of 800m at the northern end of the tunnel. Dolomite and magnesian limestone interspersed with numerous fissured and cracked zones were found next, and these were followed by water-saturated sections. The rock in the middle section of the tunnel fell away from its dry bedding. Beneath the dark chalky clay was found an older type of friable dolomite. In the Nocera-Salerno tunnel, initial trials to seal the walls were carried out using films based upon polyethylene or chloroprene polymers; these did not, however, solve the problem, as water seeped through the anchorage points. The problem was finally solved using Araldite epoxy resins. The most important aspect of this lay in making a formulation which would guarantee perfect adhesion and sealing of an already wet surface. At the same time, the membrane had to be sufficiently elastic over the transverse and longitudinal joints, to resist tearing if there was subsequent slight movements of the sections.

  • Availability:
  • Corporate Authors:

    Lomax Erskine and Company, Limited

    8 Buckingham Street
    London WC2N 6LA,   England 
  • Publication Date: 1972-11

Media Info

  • Features: Figures; References;
  • Pagination: p. 571
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00048008
  • Record Type: Publication
  • Source Agency: Tunnels and Tunnelling
  • Files: TRIS
  • Created Date: Jan 4 1974 12:00AM