THERMAL-MECHANICAL FRAGMENTION-A PROMISING METHOD FOR HARD-ROCK EXCAVATION

A promising technique under investigation at the University of Missouri Rolla utilizes high-energy heat sources placed in drill holes in the rock to form a designed pattern of thermal-stress fields that cause the rock to fracture in a manner somewhat analogous to breakage in a blasting round. Fracture is aided with rock splitters. For controlled fragmentation, theoretical studies indicate that the thermal inclusions should be concentrated in a plane as close to the bottom of the heater holes as possible. For a fragmentation method, possible trade-off costs will be labor reduction, higher rate of advance, and other factors. /HRIS/

  • Corporate Authors:

    U.S. National Committees/Tunnelling Technology

    2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Clark, G B
  • Publication Date: 1974-3

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Filing Info

  • Accession Number: 00081506
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 6 1975 12:00AM