A major road tunnel being constructed under the centre of Oslo will comprise 1520 m blasted through bedrock and 270 M cut and cover in the first stage followed by a further 430 M cut and cover and 400 m of submerged tube tunnel. The entire project involves the construction of a new 6-lane highway, links with the e18 and the building of both over- and underground interchanges. Geological conditions encountered are extremely varied. Despite tight vibration limits, the need for pregrouting and the ability to keep vibrations under control has led to the choice of drill and blast techniques for tunnelling. Drilling is carried out by 4 atlas copco th178 three-boom and basket jumbos equipped with 1440 rocket hydraulic drifters, the first application of such machines in the tunnelling industry. Details are given of charging and blasting operations which include the use of a prototype 500 l nitro nobel anfo charger. Details are given of pregrouting operations. The geometry and thickness of concrete linings are discussed. The design chosen which provides a pressure arch effect around the whole cross-section is described as the 'Oslo method'. (TRRL)

  • Availability:
  • Corporate Authors:

    Mining Journal Limited

    60 Worship Street
    London EC2A 2HD,   England 
  • Authors:
    • Smith, M
  • Publication Date: 1988-3

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00491633
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1990 12:00AM