SOIL MOISTURE MOVEMENT DURING ICE SEGREGATION

INITIAL RESULTS ARE REPORTED OF A CONTINUING RESEARCH STUDY OF FROST ACTION PROCESSES IN SOIL UNDERTAKEN RECENTLY BY THE DIVISION OF BUILDING RESEARCH OF THE NATIONAL RESEARCH COUNCIL OF CANADA. MOISTURE FLOW TO THE FREEZING ZONE OF SMALL SOIL SPECIMENS HAS BEEN MEASURED UNDER CONTROLLED LABORATORY CONDITIONS. THE EXPERIMENTAL FINDINGS AGREE WITH THE NOW GENERALLY ACCEPTED CONCEPT OF FROST HEAVING OUTLINED BY TABER AND BESKOW. IN SOIL SYSTEMS WHERE A FREE WATER SURFACE EXISTS NEAR BUT BELOW THE FREEZING ZONE, THE RESULTS INDICATE THAT MOISTURE FLOW IS DEPENDENT ON THE UNSATURATED PERMEABILITY AND SOIL MOISTURE TENSION CHARACTERISTICS. BOTH THESE SOIL PROPERTIES INTEGRATE THE EFFECT OF GRAIN SIZE STRUCTURE, CLAY COMPOSITION, AND EXCHANGE IONS AMONG OTHERS. CRITICAL DESATURATION BENEATH THE FROST LINE IN SOME SOILS APPEARS TO ACT AS A BARRIER TO LIQUID MOISTURE TRANSMISSION. SINCE IN THE HEAVIER-TEXTURED SOILS, RAPID MOISTURE TRANSMISSION CONTINUES TO MUCH HIGHER TENSION VALUES, GREATER HEAVE RATES ARE OBSERVED. /AUTHOR/

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  • Supplemental Notes:
    • No 135, pp 109-118, 10 FIG, 10 REF 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
  • Authors:
    • Penner, Edward
  • Publication Date: 1956

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  • Accession Number: 00237490
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 15 1994 12:00AM