The 17.5 mile long Kielder tunnel, designed to transfer 13.6 cubic metres/sec of water from the river Tyne to the wear and tees will, when completed in 1980, form the longest tunnel in Britain. It will also reach the deepest level of 1000 feet. The contractors, a consortium of British, German and Swiss companies, are using two demag tunnelling machines. The support system, which was the subject of an earlier experiment, will be sprayed concrete, rock bolts or a combination of both. Steel arches may be used in fault zones or areas of very poor rock, although in general they are unsuitable for water tunnels because they require another lining as well as grouting. Rock bolts were not satisfactory in frequently jointed sandstone and they need to be longer, more closely spaced or combined with sprayed concrete. Concrete fired from a compressed air gun onto the rock surface as it is exposed offers a simple solution although the stiffening rate of the concrete is critical. The Kielder tunnel is expected to provide useful data on support system theory through a variety of sandstone, limestone and mudstone conditions. /TRRL/

  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Publication Date: 1975-11-7

Media Info

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Filing Info

  • Accession Number: 00133730
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 23 1976 12:00AM