TWO METHODS FOR QUANTITATIVE DESCRIPTION OF SOIL PARTICLE SHAPE

IT WAS REQUIRED TO BE ABLE TO MEASURE THE SHAPES OF SOILD PARTICLES IN ORDER THAT THE INFLUENCE OF SHAPE ON SOIL MECHANICAL PROPERTIES COULD BE INVESTIGATED. TWO METHODS WERE DEVELOPED, BOTH OF WHICH CAN BE APPLIED TO PARTICLE CROSS-SECTIONS OR OUTLINES. THE FIRST IS A SHAPE FUNCTION WHICH COMPARES CHORD LENGTHS WITH ARC LENGTHS AROUND THE PARTICLE OUTLINES. THE SECOND METHOD INVOLVES TAKING DISCRETE FOURIER TRANSFORMS OF THE NORMALIZED CURVATURES OF THE OUTLINES, AND THE PRODUCTION OF CURVATURE SPECTRA. BOTH METHODS ARE ILLUSTRATED WITH THE USE OF THE SAME DATA. THE DATA WERE FOR THREE SIZES OF PARTICLE FROM A SANDY SOIL. BOTH METHODS ILLUSTRATE THE GREATER ASPHERICITY OF ANGULARITY OF THE SMALLER PARTICLES, WHICH IS CONSISTENT WITH THE GRIFFITH THEORY OF COMMINUTION. CHANGE IN SHAPE WITH PARTICLE SIZE MAY BE USEFUL FOR CLASSIFYING SOILS ACCORDING TO THEIR METHODS OF FORMATION. /AUTHOR/

  • Availability:
  • Corporate Authors:

    Oxford University Press

    Press Road, Neasden
    London NW10 0DD,   England 
  • Authors:
    • Davis, P F
    • Dexter, A R
  • Publication Date: 1972-12

Media Info

  • Features: Figures; References;
  • Pagination: p. 448-55
  • Serial:
    • JOURNAL OF SOIL SCIENCE
    • Volume: 23
    • Issue Number: 4
    • Publisher: Blackwell Scientific Publications Limited
    • ISSN: 0022-4588

Subject/Index Terms

Filing Info

  • Accession Number: 00238251
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Nov 14 1973 12:00AM