RESEARCH INVESTIGATION OF LASER ROCK KERFING

A STUDY WAS PERFORMED ON A CONCEPT OF UTILIZING A FOCUSED HIGH-POWER LASER BEAM TO CUT A KERF AT THE GAGE OF A HARD- ROCK TUNNEL. SUCH A CONCEPT WOULD ELIMINATE MECHANICAL GAGE CUTTERS. CUTTING TESTS WERE PERFORMED IN A VARIETY OF HARD ROCK TYPES WITH A CONTRACTOR-OWNED FIVE KILOWATT CO2 LASER. TEST RESULTS WERE ANALYZED TO ALLOW APPROXIMATION OF POWER LEVELS REQUIRED FOR FULL-SCALE TUNNELING. A DESIGN AND COST METHODOLOGY WAS DERIVED TO ALLOW ESTIMATION OF LASER COSTS IN THE SIZE RANGE OF INTEREST. FENIX & SCISSON, INC., ACTING AS SUBCONTRACTOR TO UARL, DEVELOPED INFORMATION ON COST AND PERFORMANCE OF MECHANICAL TUNNELING IN HARD ROCK, WITH EMPHASIS ON THE GAGE CUTTING PROBLEM. IT IS CONCLUDED THAT THIS CONCEPT WILL WORK, AND THAT COST BENEFITS WILL BE REALIZED IN LARGE-SIZE TUNNELS (20-FT-DIAMETER OR GREATER) IN HARD ROCK (30,000 PSI OR GREATER). ADVANCES IN LASER TECHNOLOGY WILL EXTEND THE ECONOMIC DESIRABILITY OF THIS TECHNIQUE TO SMALLER TUNNELS AND SOFTER ROCK. IT IS RECOMMENDED THAT FUTURE WORK BE DIRECTED TOWARD RUNNING LABORATORY TESTS OF COMBINED THERMAL AND MECHANICAL ROCK- CUTTING, TO SIMULATE THE ROCK FRACTURE CONDITIONS EXPECTED IN THE FULL-SCALE CASE. /AUTHOR/

  • Supplemental Notes:
    • Rept No L-911329-8 2 APP
  • Corporate Authors:

    United Aircraft Corp Res Lab

    ,    
  • Authors:
    • Carstens, J P
    • Banas, C M
    • Biancardi, F R
    • Melikian, G
    • Peters, G T
    • Jurewicz, B R
    • Sessions, E C
  • Publication Date: 1972-11

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 219 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00236500
  • Record Type: Publication
  • Report/Paper Numbers: Final Rept
  • Files: TRIS
  • Created Date: Apr 11 1974 12:00AM