CRITERIA FOR BRITTLE FRACTURE INITIATION IN AND ULTIMATE FAILURE OF ROCKS AND THEIR APPLICATION TO FRACTURE ZONE PREDICTION

IT IS POSTULATED THAT TWO "COEFFICIENTS OF FRICTION" CAN BE REGARDED AS CONTROLLING BOTH FRACTURE INITIATION IN AND ULTIMATE FAILURE OF ISOTROPIC BRITTLE ROCKS IN ACCORDANCE WITH EITHER GRIFFITH'S ORIGINAL THEORY OR THAT AS MODIFIED BY MCLINTOCK AND WALSH. ON THE BASIS OF THIS POSTULATE, BOTH THE ORIGINAL AND MODIFIED THEORIES HAVE BEEN RECONSIDERED AND CRITERIA FOR DESCRIBING FRACTURE INITIATION AND ULTIMATE FAILURE OF THE ROCK SUBSTANCE HAVE BEEN DERIVED, TOGETHER WITH THEIR LIMITS OF VALIDITY. RESULTS OF LABORATORY TESTS PERFORMED TO CHECK THE VALIDITY OF THE POSTULATES ARE PRESENTED. COMPARISON BETWEEN EXPERIMENT AND THEORY SHOWS THAT THE ANALYSIS IS APPLICABLE TO TWO OF THE THREE ROCKS TESTED. IN THE THIRD ROCK, DUCTILE BEHAVIOR PRECLUDES THE USE OF THE EQUATIONS DERIVED FOR BRITTLE FAILURE. AN ESTIMATE OF FRACTURE CRITERIA FOR FAILURE OF THE ROCK MASS UNDER TRIAXIAL STRESS CONDITIONS IS OBTAINED. THESE ROCK MASS CRITERIA ARE THEN USED TO ESTIMATE ANALYTICALLY THE EXTENT OF THE ZONE OF FRACTURED ROCK AROUND AN UNDERGROUND HAULAGEWAY SUBJECT TO VARIOUS STRESS CONDITIONS. THE ANALYTICAL SOLUTIONS COMPARE FAVORABLY WITH IN-SITU MEASUREMENTS OF FRACTURE ZONE EXTENT. /AUTHOR/

  • Supplemental Notes:
    • Vol 2, No 3-37, PP 251-259, 6 FIG, 4 TAB, 12 REF
  • Authors:
    • Barron, K
  • Publication Date: 1970

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Filing Info

  • Accession Number: 00236186
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 22 1972 12:00AM