INTERPRETATION OF IN SITU PERMEABILITY TESTS ON ANISOTROPIC DEPOSITS

To calculate the permeability of a soil from the results of in situ constant- or variable-head tests, one must know the intake factor for the porous tip used. The intake factor for a cylindrical tip of a piezometer is a function of its length and diameter only. No rigorous relationship has yet been derived, but an accurate empirical formula based on the best fit and previously published numerical solutions expresses the intake factor in a dimensionless form as a function of the ratio of the length to diameter of the tip. When tests are carried out in a horizontally bedded cross-anisotropic deposit (e.g., a laminated lacustrine clay), the permeability, calculated by assuming isotropy, will have a value intermediately between the horizontal and vertical permeabilities. If the ratio of these permeabilities is known from laboratory or other tests, a correction factor may be applied to the permeability (assuming isotropy) to determine the coefficients of permeability in the horizontal and vertical directions. The correction factor, which is a function of both the ratio of intake length to intake diameter and the ratio of the coefficient of the permeability in the horizontal position to that in the vertical position, is presented in graphical form to enable quick determination of the directional permeabilities.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1975/532/532-004.pdf
• Summary URL:
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Subsurface Drainage. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Corporate Authors:

  Transportation Research Board

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• Authors:
  • Dunn, C S
  • RAZOUKI, S S
• Conference:
  • 54th Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia
  • Date: 1975-1-13 to 1975-1-17
• Publication Date: 1975

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 43-48
• Monograph Title: FROST, MOISTURE, AND EROSION
• Serial:
  • Transportation Research Record
  • Issue Number: 532
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Anisotropic materials; Calculation; Field tests; Formulas; Isotropy; Lacustrine deposits; Measurement; Permeability; Permeability coefficient; Piezometers; Soils
• Uncontrolled Terms: Computation; Interpretation
• Old TRIS Terms: Anisotropic mass; Insitu methods; Permeability measurement; Soil permeability
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00099653
• Record Type: Publication
• ISBN: 0309023807
• Files: TRIS, TRB
• Created Date: Nov 5 1975 12:00AM