ROCK FRACTURE BY HIGH SPEED WATER JET

ROCK BREAKAGE PHENOMENA BY HIGH SPEED WATER JETS IS DISCUSSED. THE WATER JETS WERE 1 MM (0.039 IN.) IN DIAMETER, TRAVELING AT 1200 M/SEC (4000 FPS) AND HAD A DURATION OF NEARLY 1.5 SECS. SIX ROCK TYPES, VIZ. FRENCH CREEK GABBRO, MILFORD PINK GRANITE, CONNECTICUT BROWNSTONE, MINNESOTA DOLOMITE, INDIANA LIMESTONE, AND MASSILLON SANDSTONE, RANGING IN COMPRESSIVE STRENGTH FROM 390 MN/ (SQ M) TO 3/ MN/ (SQ M) (56,900 PSI TO 4,400 PSI) WERE USED FOR THE EXPERIMENTS. ONLY SINGLE SHOT TESTS WERE CONDUCTED. A NUMBER OF THE FRENCH CREEK GABBRO AND CONNECTICUT BROWNSTONE SPECIMENS SPLIT APART; THE OTHERS WERE PENETRATED BY A NARROW HOLE. THE DEPTH OF THE HOLE VARIED FROM 3.2 CM TO 16.7 CM (1.2 IN TO 6.6 IN.) DEPENDING ON THE ROCK TYPE AND EXPERIMENTAL CONDITIONS. THE SPECIFIC ENERGY CONSUMPTION FOR THESE TESTS VARIED BETWEEN 4000 J/CC AND 340000 J/CC, BUT THESE VALUES CAN BE LOWERED ONE OR TWO ORDERS OF MAGNITUDE BY TRAVERSING THE JET OR USING MULTIPLE SHOTS. THE SPECIFIC ENERGY WAS FOUND TO DECREASE WITH AN INCREASE IN THE SPECIFIC PRESSURE (STAGNATION PRESSURE/COMPRESSIVE STRENGTH), UP TO SPECIFIC PRESSURES OF NEARLY THIRTY-FIVE (35). THE MECHANICAL PROPERTIES OF THE VARIOUS ROCKS WERE DETERMINED AND CORRELATED WITH TEH DAMAGE INCURRED BY WATER JET IMPINGEMENT. /AUTHOR/

• Corporate Authors:

  IIT Research Institute

  10 West 35th Street
  Chicago, IL  United States  60616
• Authors:
  • Huck, P J
  • Singh, M M
• Publication Date: 1970-12

Subject/Index Terms

• TRT Terms: Fracture mechanics; Loss and damage; Rocks; Water pressure; Waterjets
• Subject Areas: Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00215453
• Record Type: Publication
• Source Agency: Government Printing Office
• Report/Paper Numbers: 98 pp
• Files: TRIS
• Created Date: Jan 31 1972 12:00AM