A LABORATORY STUDY OF THE INFILTRATION CHARACTERISTICS OF COARSE GRAINED SOILS

The soil parameters which are used to describe infiltration into non-swelling soils are introduced and then the sorptivity aproach which has been applied by McInnes is compared with the green and ampt parameters applied by the author. Procedures for carrying out and analysing the results of vertical infiltration and capillary rise tests are described in detail. The results of a series of tests on a compact silty sand and loose sandy loam are then described to illustrate some of the principles of infiltration and drainage of unsaturated pavement materials. The results show that the infiltration characteristics are critically dependent on the distribution of air that is trapped in the voids and that this varies both with initial moisture content and with time after initial wetting. Except for saturation and loosening of the upper 10 to 20 mm of vertical infiltration specimens, it appears that the 5 per cent air voids condition is a good approximation to the maximum degree of wetting up during infiltration. The final section of the report discusses the selection of soil parameters when making design decisions on the extent and degree of wetting of pavement and subgrade, the possibility of shoulder water entry and cross section design to limit water entry. (A)

  • Corporate Authors:

    James Cook University, North Queensland

    Townsville, Queensland 4811,   Australia 
  • Authors:
    • WALLACE, K B
    • Hines, N K
    • Golding, W R
  • Publication Date: 1977-6

Media Info

  • Features: Figures; Tables;
  • Pagination: 46 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00184526
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Intrm Road Rpt 14 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Feb 27 1979 12:00AM