BLASTING FROZEN GROUND WITH COMPRESSED AIR

TECHNIQUES FOR RAPIDLY EXCAVATING FROZEN GROUND ARE REVIEWED. A TUNNELLING MACHINE INCORPORATING A COMBINED AUGER/BLAST TUBE IS FEASIBLE FOR TUNNELING IN FROZEN SILT. SUCH A DEVICE CAN BE MADE ROBUST AND CAPABLE OF WITHSTANDING THE WEIGHT OF THE FALLING MATERIAL. A DIRECT COMPARISON IS DIFFICULT OF AIR BLASTING AGAINST EXPLOSIVES BECAUSE TESTS UNDER THE SAME CONDITIONS ARE NOT FEASIBLE. SURFACE EXCAVATION IN FROZEN GROUND USING CONVENTIONAL RIPPING TECHNIQUES IS OFTEN DIFFICULT. TESTS AT THE FOX TUNNEL SITE SHOWED THAT THE FROZEN SILTS WERE JUST RIPPABLE USING A LARGE (D8) TRACTOR ALTHOUGH ECONOMIC CONSIDERATIONS BASED ON TIME AND EXCESSIVE TOOL WEAR WOULD PROBABLY RULE OUT SUCH AN OPERATION. THE FROZEN GRAVELS WERE NOT RIPPABLE. AIR BLAST RIPPING TILES WERE NOT SUCCESSFUL BECAUSE THE AIR NEEDS CRACKS OR JOINTS INTO WHICH TO PENETRATE AND WHEN THESE ARE NOT PRESENT THE BLASTING ACTION IS LIMITED. AS LONG AS IT IS CONFINED, HIGHLY COMPRESSED AIR IS AN EFFICIENT TECHNIQUE FOR TRENCHING IN FROZEN GROUND. A MACHINE INCORPORATING A COMBINED DRILL/BLAST SHELL APPEARS TO BE A FEASIBLE PROPOSITION FOR BREAKING UP STRONG, HIGHLY FROZEN SURFACE LAYERS.

  • Supplemental Notes:
    • Tech Memo NO 96, PP 39-58, 15 FIG, 1 TAB, 6 REF, 1 APP
  • Corporate Authors:

    Canadian Conf Proc On Permafrost

    /Third Conf
    ,   USA 
  • Authors:
    • Mcanerney, J
    • Hawkes, I
    • Quinn, W
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00232789
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 24 1970 12:00AM