UNSATURATED TRANSIENT AND STEADY-STATE FLOW OF MOISTURE IN SUBGRADE SOIL
A general procedure for determining the soil-water properties necessary for predicting moisture movement in subgrade soils is described. A gamma-ray transmission method was used for the nondestructive measurement of the water content and a tensiometer-pressure transducer arrangement to measure the soil-water pressure (suction); the unsaturated hydraulic conductivity, diffusivity, and soil-water characteristic functions were evaluated for AASHO A-4 subgrade soil. The soil was compacted in a column at uniform density and moisture content and tested under isothermal conditions. A water table was established at the bottom of the soil column and the transport of water through the subgrade soil studied. The mathematical procedures for determining the soil-water properties from the laboratory data are described, and the use of the experimentally determined hydraulic conductivity, soil-water diffusivity, and soil-water characteristic functions in the prediction of moisture changes in an AASHO A-4 soil is demonstrated. /Author/
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309025885
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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
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Authors:
- Elzeftawy, Atef
- Dempsey, Barry J
- Publication Date: 1976
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: pp 56-61
- Monograph Title: Subsidence over mines and caverns, moisture and frost actions, and classification
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Serial:
- Transportation Research Record
- Issue Number: 612
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Diffusivity; Gamma rays; Moisture content; Motion; Nondestructive tests; Permeability coefficient; Soil water; Subgrade (Pavements); Water table
- Uncontrolled Terms: Moisture movement
- Old TRIS Terms: Soil water content; Subgrade moisture
- Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;
Filing Info
- Accession Number: 00158158
- Record Type: Publication
- ISBN: 0309025885
- Files: TRIS, TRB
- Created Date: Sep 28 1977 12:00AM