MICROFRACTURING OF A SANDSTONE IN UNIAXIAL COMPRESSION

THE DEVELOPMENT AND PROPAGATION OF MICROCRACKS IN THE COURSE OF LOADING HAS BEEN INVESTIGATED WITH RESPECT TO STRESS LEVEL AND THE RATE OF STRAINING. MAPS OF THE MICROCRACKS COVERING ENTIRE AXIAL SECTIONS THROUGH THE CENTRE OF THE SPECIMENS WERE PREPARED AND ANALYSED. MICROFRACTURING INVARIABLY RESULTED FROM FAILURE OF THE CEMENTITIOUS MATRIX (CLAY, SILT AND LIMONITE) RATHER THAN THE GRAINS (PRIMARILY QUARTZ AND ROCK FRAGMENTS) AT ALL STRESS LEVELS AND RATES OF LOADING. FAILURE (MAXIMUM STRESS) WAS FOUND TO BE ASSOCIATED WITH AN INCREASE IN THE NUMBER OF UNIFORMLY SPACED SHORT CRACKS RATHER THAN AN INCREASE IN THEIR LENGTH. MICROFRACTURING RESULTED FROM CRACKS INITIATING FROM THE SPECIMEN SURFACE. HOWEVER, IT WAS ONLY AFTER STRAINING BEYOND MAXIMUM STRESS THAT THE PATH OF POTENTIAL MICROFRACTURE BECAME APPARENT FROM MICROSCOPIC OBSERVATIONS. /AUTHOR/

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,   England 
  • Authors:
    • SANGHA, C M
    • Talbot, C J
    • Dhir, R K
  • Publication Date: 1974-3

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Filing Info

  • Accession Number: 00263413
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 13 1974 12:00AM