A METHOD OF PREDICTING HYDRAULIC CONDUCTIVITY AND WATER DIFFUSIVITY FOR PAVEMENT SUBGRADE SOILS

A method of predicting the hydraulic conductivities and soil-water diffusivities of pavement subgrade soils is discussed. The method utilizes the soil moisture content-suction head relation, H (theta), to calculate the unsaturated hydraulic conductivity of the soil. The value of the hydraulic conductivity at saturation, K sub s (the soil permeability), is used as a matching factor during the calculations. The H(theta) relations and the saturated conductivities, K sub s, of the soils were determined in the laboratory using the commercially available "Tempe" cell. Disturbed and undisturbed samples of Drummer, Fayette-C, Ottawa sand, and Class X concrete sand subgrade soils were used in this study. From the comparison between the experimental and calculated values, it can be concluded that the method successfully predicts the hydraulic conductivities of pavement subgrade soils.

  • Record URL:
  • Supplemental Notes:
    • Sponsored by Illinois DOT and conducted in cooperation with DOT, Federal Highway Administration.
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Engineering Experiment Station
    Urbana, IL  USA  61801
  • Authors:
    • Elzeftawy, A
    • Dempsey, B J
  • Publication Date: 1976-12

Media Info

  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158055
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-IL-UI-164, FCP 45C2161
  • Contract Numbers: IHR-604 HP&R
  • Files: TRIS, USDOT
  • Created Date: Oct 13 1977 12:00AM