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  United States  61801-2352

  National Science Foundation

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

Media Info

• Pagination: 48 p.

Subject/Index Terms

• TRT Terms: Abrasions; Construction projects; Geological events; Hardness; Pendulum tests; Penetration resistance; Physical properties; Ratios; Rock excavation; Rock mechanics; Rocks; Tunneling; Tunneling machines; Velocity
• Old TRIS Terms: Geological conditions; Indexes ratios; Rock properties; Rock tunneling
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; Vehicles and Equipment;

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