STRENGTH DISTRIBUTION IN HARD ROCK

A REPRESENTATIVE SAMPLE OF HARD ROCK WAS OBTAINED. A GOOD APPROXIMATION OF THE ACTUAL DISTRIBUTION OF UNIAXIAL COMPRESSIVE STRENGTH RESULTED FROM SEPARATION OF TWO GROUPS OF SPECIMENS-SOUND CORE AND DEFECTIVE CORE. BOTH GROUPS APPEAR TO BE NORMALLY DISTRIBUTED. THE VAIATION IN STRENGTH IS HIGH. IN THE PARTICULAR CASE OF MATINENDA SANDSTONE THE COEFFICIENT OF VARIATION IS 15 PERCENT AND 46 PER CENT FOR SOUND AND DEFECTIVE CORE RESPECTIVELY, AND 28 PER CENT FOR ALL THE SPECIMENS TAKEN TOGETHER. AN EFFECT OF SIZE ON STRENGTH AS WELL AS ON MODULUS OF DEFORMATION WAS DETECTED. A LINEAR EXTRAPOLATION BETWEEN LOGARITHMS OF STRENGTH AND VOLUME YIELDS A REASONABLE VALUE OF ABOUT 20,000 PSI FOR PILLAR STRENGTH. /TRRL/A/

  • Availability:
  • Authors:
    • Kostak, B
    • Bielenstein, H U
  • Publication Date: 1971-9

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Filing Info

  • Accession Number: 00235289
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Aug 3 1972 12:00AM