REAM. EXCAVATION OF TUNNELS BY THE USE OF SMOOTH-BORE CANNONS TO FIRE SOLID 10 LB CONCRETE PROJECTILES INTO THE ROCK

DETAILS ARE GIVEN OF THE TUNNEL DRIVING TECHNIQUE KNOWN AS REAM, DEVELOPED BY THE PHYSICS INTERNATIONAL CO., USA, FOR ROCK DISTINTEGRATION; THIS TECHNIQUE MAKES USE OF THE ENERGY OF INEXPENSIVE, HIGH-VELOCITY PROJECTILES WHICH, WHEN FIRED AT A ROCK FACE, FRACTURE AND EJECT ROCK BY THE INTERACTION OF SUCCESSIVE IMPACTS. IN TRIALS SO FAR CONDUCTED, A 105 MM MILITARY SMOOTH BORE GUN WAS USED, CAPABLE OF ACCELERATING 10 LB PROJECTILES TO 500 FT/SEC. AT THE RATE OF ONE SHOT PER MINUTE. EACH SHOT BREAKING AN AVERAGE OF 1.5 TONS OF ROCK. A COST EVALUATION OF THE TECHNIQUE IS INCLUDED.

Language

  • English

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 117-80
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00230481
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: May 24 1974 12:00AM