STRUCTURAL PERFORMANCE OF A TEMPORARY TUNNEL LINED WITH SPHEROIDAL GRAPHITE CAST IRON

An experimental lining of spheroidal graphite iron built from rings of twelve segments and a key was used to line A 60 ft length of 12 ft 8 in. Dia. Tunnel in London clay. One ring was equipped with strain gauges to measure the bending experienced when a similar tunnel of 12 ft 7 in. Dia. Was driven past only 2 ft 3 in. Away. Diametrical distortion was also measured. The observations are compared with similar ones on an instrumented ring of six segments and a key, made from ordinary cast iron which was of the type used for the rest of the tunnelling at the site. The results show the operation to have been safe using either kind of lining and that spheroidal graphite iron is a suitable material for tunnel lining. They also demonstrated that economies in the use of iron and improved design of the cross joints could be accomplished. (A). /TRRL/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 89-108
  • Serial:
    • Volume: 61

Subject/Index Terms

Filing Info

  • Accession Number: 00137500
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 6 1976 12:00AM