Repair and modification of NZ railway tunnels

The current NZ rail network is approximately 4000km long with 145 tunnels ranging in length from 50m to 9km and with a total length of 87km. The tunnels were opened between 1867 and 1980 and have been constructed in a diverse range of geological conditions. Tunnel cross-sections and lining arrangements have varied over the period and only two tunnels can be considered as being modern designs. The tunnels have performed remarkably well and the major reasons for modifications have been invert lowering to provide greater clearances for larger rolling stock or to permit electrification. A few tunnels have required works to repair lining failures due to swelling ground pressures and in a small number of tunnels lining repairs have been required to remedy lining deterioration due to a low standard initial construction. This paper describes the philosophy and approach taken in the repair and modification of a number of tunnels over the last 30 years.

Media Info

  • Pagination: 12p.
  • Monograph Title: Rejuvenation and renaissance: CORE 2010: conference on railway engineering, 12-15 September 2010, Wellington, New Zealand

Subject/Index Terms

Filing Info

  • Accession Number: 01517063
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Mar 4 2014 8:06PM