IMPROVING UNDERGROUND EXCAVATION THROUGH THE APPLICATION OF HYDRAULIC WATER JET ASSISTED MECHANICAL TUNNEL BORING

Field tests were conducted in a granite quarry near Skykomish, Washington, to verify the concept of improving tunneling rates with water jet assisted mechanical cutting. Three different jet patterns were investigated, with only the configuration of jets between cutters being successful. Machine torque requirements were reduced approximately 25 percent when the water jets were used due to reduced cutterhead friction in the presence of the water. A comprehensive economic analysis was undertaken to determine the degree of cost benefits attainable from increased advance rates. Significant savings were seen to be possible depending on the percentage improvement assumed. Two complementary studies for insuring the rapid development and application of the technology are suggested: a laboratory optimization study and a field implementation program. The laboratory study should produce design parameters which take advantage of the two systems and the interaction between the two. The field implementation of water jet assisted tunneling should reveal the capabilities and benefits of the system and indicate any system design modifications required based on field experience.

  • Corporate Authors:

    Colorado School of Mines

    Excavation Engineering and Earth Mechanics Institute
    Golden, CO  USA  80401

    National Science Foundation

    Research Applied to National Needs
    Washington, DC  USA  20550

    Bureau of Mines

    C Street Between 18th and 19th Streets, NW
    Washington, DC  USA  20241
  • Authors:
    • Wang, F
    • ROBBINS, R
    • Olson, J
  • Publication Date: 1976-2

Media Info

  • Pagination: 184 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00143089
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NSF/RA-760092
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM