A full-face hard-rock tunnel boring machine (jarva mk21) was used to excavate the Kaimai Tunnel. Back-up equipment to serve this machine was designed and built in New Zealand. The machine was not successful in boring the hard and blocky andesite of the western end of the tunnel but it readily handled the softer ignimbrites of the eastern end. Operations from the eastern end of the tunnel were severely hampered in the early stages by major breakdowns. Assessment of the machine's performance revealed that, although not as spectacular as was envisaged, it met expectations and justified the use of this tunnelling method at Kaimai. An illustrated article describes the machine and its operation.

  • Availability:
  • Corporate Authors:

    Technical Publications Limited

    C.P.O. 3047
    Wellington,   New Zealand 
  • Authors:
    • Harrison, K J
    • Taylor, REC
  • Publication Date: 1978-3


  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 50-55
  • Serial:
    • Volume: 33
    • Issue Number: 3
    • Publisher: Institution of Professional Engineers New Zealand
    • ISSN: 0028-808X

Subject/Index Terms

Filing Info

  • Accession Number: 00189219
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM