ROCK INDEX PROPERTIES TO PREDICT TUNNEL BORING MACHINE PENETRATION RATES

To successfully bid a tunneling contract by machine, a contractor must have a reliable estimate of expected penetration rates and cutter costs. Preferably, these predictions should be independent of those supplied by machine and cutter manufacturers. Therefore, a series of rock index tests have been developed and incorporated in routine Rock Mechanics testing for the purpose of predicting rock boreability. Index properties were evaluated empirically by using rock samples and pertinent construction records from recently machined tunnels. Samples were taken from the completed tunnel walls, tested parallel to machine penetration, and results were compared to localized rates of penetration.

  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Civil and Environmental Engineering
    205 North Mathews Avenue
    Urbana, IL  USA  61801-2352

    National Science Foundation

    1800 G Street, NW
    Washington, DC  USA  20550
  • Authors:
    • TARKOY, P J
  • Publication Date: 1974-6

Media Info

  • Pagination: 48 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00090701
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PJT-6
  • Contract Numbers: NSF-GI-36468
  • Files: TRIS
  • Created Date: Jun 26 1975 12:00AM