INVESTIGATION INTO THE MECHANICAL PROPERTIES OF CRACKED ROCK

THE INFLUENCE OF CRACKS ON THE STRENGTH OF ROCK MASSIVES HAS BEEN INVESTIGATED USING THE ROCK AND THE EQUIVALENT MATERIAL SAMPLES. THE DEPENDENCE BETWEEN TANGENT STRESSES ON THE SURFACE OF WEAKENING AND THE NORMAL PRESSURE HAS IN THE GENERAL CASE A CURVI-LINEAR CHARACTER. HOWEVER, TILL THE PRESSURE IS EQUAL TO 30 KG/CM SQUARED IT MAY BE ADOPTED AS A STRAIGHT LINE. THE ANGLE OF INTERNAL FRICTION OF MONOLITHIC SAMPLES CONCIDES WITH THE ANGLE OF FRICTION WHILE SLICE ON SLICE TESTING. THAT IS ALSO CONFIRMED BY THE EQUIVALENT MATERIAL TESTING. THE INFLUENCE OF ROUGHNESS ON THE RESISTANCE TO DISPLACEMENT HAS BEEN SHOWN. THE STRENGTH OF A MASSIF, RESEMBLING A DRYMASONRY, WAS EVALUATED BY TESTING THE EQUIVALENT MATERIAL IN THE CONDITIONS OF ONE-AXIS PRESSURE. THE INFLUENCE OF QUANTITY OF CRACKS ON THE STRENGTH OF THE CONSITUENT BLOCKS REVEALED IN THE LABORATORY COINCIDES WITH THE DATA OF FIELD INVESTIGATIONS. THE LIMIT OF QUASIUNIFORMITY OF A MASSIF WAS DETERMINED AS A LIMIT OF JOINTING INTENSIVITY NOT INFLUENCING STRENGTH. THE INSTALLATION FOR DETERMINING THE WATER PERMEABILITY OF ROCK SAMPLES WITH THE CONSTANT HEAD AND WITH WORKING PRESSURE TO 75 ATM IS DESCRIBED. THE INFLUENCE OF THE NUMBER OF WETTING- DRYING CYCLES ON THE WATERABSORPTION HAS BEEN INVESTIGATED. SOME FIELD EXPERIMENTS FOR DETERMINING THE PERMEABILITY COEFFICIENT OF FISSURED PRE-CAMBRIAN GRANITES AND GNEISSES ARE DESCRIBED. THE PERMEABILITY COEFFICIENT OF THE STRONGLY WEATHERED UPPER ZONE WITH THE KAOLINISATION ALONG THE CRACKS, PROVED TO BE APPROXIMATELY 10-15 TIMES LESS THAN OF THE UNDERLYING CRACKED ROCKS IN WHICH THE CHEMICAL WEATHERING IS NOT OBSERVED. /RRL/LCPC/

  • Supplemental Notes:
    • Vol 1, No 3.49, PP 521-524, 7 FIG, 2 TAB, 3 REF
  • Corporate Authors:

    Nat Lab Civil Eng, Lisbon /Port

    ,    
  • Authors:
    • Goldstein, M
  • Conference:
  • Publication Date: 1966

Subject/Index Terms

Filing Info

  • Accession Number: 00234569
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Sep 15 1994 12:00AM