DESIGN AND ECONOMIC CONSTRAINTS OF THERMAL ROCK WEAKENING TECHNIQUES

ANALYTICAL PREDICTIONS OF THE ROCK WEAKENING BY THERMAL SOURCES ARE USED TO COMPARE THE RELATIVE COST OF ENHANCING ROCK EXCAVATION BY LASERS, ELECTRON BEAMS, MICROWAVES, RADIANT HEATERS AND TORCHES. THESE ESTIMATES INDICATE THAT THE EXPENSE OF MICROWAVES IS PROHIBITIVE WHILE RADIANT HEATERS ARE THE LEAST EXPENSIVE AT $0.14 PER CUBIC FOOT. JET TORCHES ARE ALSO DESIRABLE AT AN ENERGY COST OF $0.18 PER CUBIC FOOT. DESIGN LIMITATIONS FOR THE VARIOUS METHODS ARE NOTED AND EQUIPMENT COSTS RANGE FROM $50,000 FOR ELECTRON BEAMS TO $300 FOR FLAME TORCHES. WHEN ENERGY COSTS, EQUIPMENT COSTS AND DESIGN LIMITATIONS ARE ALL CONSIDERED THE JET TORCH SEEMS THE MOST PROMISING USING COMMERCIALLY AVAILABLE EQUIPMENT. CONSIDERABLE DESIGN EFFORT WHEN APPLIED TO RADIANT HEATERS COULD PRODUCE AN EVEN MORE EFFICIENT SYSTEM FOR WEAKENING HARD ROCK. /AUTHOR/

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Lauriello, P J
    • Fritsch, C A
  • Publication Date: 1974-1

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Filing Info

  • Accession Number: 00263415
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 13 1974 12:00AM