A REVIEW OF METHODS FOR THE DETERMINATION OF THE MOISTURE FLOW PROPERTIES OF UNSATURATED SOILS

THE MOST SATISFACTORY TECHNIQUE FOR MEASURING THE UNSATURATED PERMEABILITY FUNCTION OVER THE MOISTURE SUCTION RANGE COMMONLY FOUND IN AUSTRALIAN SOILS IS BY USING THE OUTFLOW DATA FROM THE PRESSURE PLATE APPARATUS. A NUMBER OF ACCEPTABLE METHODS USING THIS TECHNIQUE ARE REVIEWED AND THE PRINCIPLES OF A NEW RAPID METHOD ARE DESCRIBED IN WHICH THE FINAL OUTFLOW VOLUME IS NOT MEASURED, BUT ESTIMATED. THIS METHOD IS NOT AS ACCURATE AS THOSE USING AN ACCURATELY MEASURED VALUE, ALTHOUGH IN MANY INSTANCES THE DIFFICULTY AND THE TIME INVOLVED IN ACCURATELY MEASURING MAY NOT BE WARRANTED. THIS APPLIES PARTICULARLY TO CLAY SOILS OF LOW PERMEABILITY, WHERE, IN ADDITION TO THE LONG TIMES REQUIRED, THE SECONDARY PERMEABILITY EFFECTS AND WATER VAPOUR LOSSES FROM THE APPARATUS MAKE ACCURATE DETERMINATIONS VERY DIFFICULT. /RRL/

  • Supplemental Notes:
    • Technical MEMO NO 5, 14 PP, 3 FIG, 13 REF
  • Corporate Authors:

    Commonwealth Scientific & Indus Res Org, Australia

    Division of Soils, 314 Albert Street
    East Melbourne, Victoria,   Australia 
  • Authors:
    • RICHARDS, B G
  • Publication Date: 1967

Subject/Index Terms

Filing Info

  • Accession Number: 00237560
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Apr 10 1994 12:00AM