THE COLLAPSE OF ELASTIC AGGREGATES

TRADITIONAL ANALYSES OF THE BEHAVIOR OF NATURAL MATERIALS ARE BASED ON A CARTESIAN ELEMENT WHOSE BEHAVIOR IS ASSUMED TO REPRESENT THAT OF A CONTINUUM. A PREFERRED APPROACH FOR MATERIALS IN GENERAL, AND FOR NATURAL AGGREGATES OF PARTICLES (SUCH AS SANDS) IN PARTICULAR, IS TO CONSIDER THE MATERIAL TO BE BUILT UP OF RANDOM ARRAYS OF SYSTEMATICALLY PACKED ZONES (SYSTONES) OF USUALLY SPHERICAL PARTICLES. FROM AN ANALYSIS OF THE FAILURE OF A TYPICAL ELASTIC ELEMENT OR SYSTONE IT IS SHOWN THAT THE STRENGTH OF A GRANULAR MEDIUM NAND THEREFORE ITS ANGLE OF INTERNAL FRICTIONE DEPENDS ON THE DISTRIBUTION ANGLE WHICH DEFINES THE ROTUNDITY OF THE PARTICLES, THE ORIENTATION OF THE SYSTONE, AND THE ANGLE OF CONTACT FRICTION BETWEEN PARTICLES. THE ORIENTATION OF SYSTONES IS PARTICULARLY IMPORTANT SINCE SHEAR STRENGTH IS DEPENDENT ON THE STRENGTH OF THE STRONGEST SYSTONE, WHICH IN THE CASE OF THE SIMPLE DISC UNIT IS INFINITE. ANALYSIS OF A THREE-DIMENSIONAL MODEL BUILT UP FROM UNIT SPHERES SHOWS THAT GRANULAR MATERIALS ARE STRONGER IN PLANE STRAIN THAN IN TRIAXIAL COMPRESSION, THE MAGNITUDE OF THIS DIFFERENCE DEPENDING UPON SYSTONE ORIENTATION, AND INTER-PARTICLE FRICTION. EXPERIMENTAL RESULTS OBTAINED BY A NUMBER OF INVESTIGATORS ARE SHOWN TO BE WELL REPRESENTED BY THE PREDICTIONS OF THIS ANALYSIS. /AUTHOR/

  • Authors:
    • Trollope, D H
  • Publication Date: 0

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  • Accession Number: 00238240
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Nov 3 1973 12:00AM