THEORY OF MOISTURE MOVEMENTS IN EXPANSIVE CLAY

A THEORETICAL BASIS IS PROVIDED FOR FURTHER STUDIES OF SWELLING CLAYS AND THE PROCESSES OF MOISTURE MOVEMENT IN THEM. EQUATIONS ARE PROPOSED AND QUESTIONS ARE RAISED, THE ANSWERS TO WHICH WILL LEAD TO A MORE COMPREHENSIVE AND ACCURATE KNOWLEDGE OF THE STRUCTURAL BEHAVIOR OF EXPANSIVE CLAY. MOISTURE FLOWS THROUGH CLAY UNDER THE INFLUENCE OF A VARIETY OF POTENTIALS. THE SIZE OF THE POTENTIALS IS IMPORTANT IN DETERMINING THE EASE WITH WHICH THE WATER TRAVELS. THE PERMEABILITY OF THE SOIL IS TREATED AS A CONCENTRATION-DEPENDENT TENSOR. THE WEIGHTED SUM OF DRIVING POTENTIALS IS TERMED SUCTION. A COMPREHENSIVE DISCUSSION OF THE SUCTION-MOISTURE CONTENT RELATION IS PRESENTED, TOGETHER WITH SOME SPECULATIVE COMMENTS ON THE REASONS FOR THE SHAPE OF THE CHARACTERISTIC SUCTION AND PERMEABILITY CURVES. THE AMOUNT OF STRESS TRANSFERRED TO THE SOIL MINERAL SKELETON BY THE WATER IS DISCUSSED IN DETAIL AND SOME FINE DISTINCTIONS ARE DRAWN CONCERNING THE UNSATURATED SOIL STRESS PARAMETERS. THE DIFFERENTIAL EQUATION FOR FLOW OF MOISTURE IN AN UNSATURATED MEDIUM IS DERIVED AND TWO ALTERNATIVE FORMS OF THIS EQUATION ARE CONSIDERED. ONE DESCRIBES A 'DIFFUSION' OF SUCTION AND THE OTHER USES A DIFFUSION OF VOLUMETRIC MOISTURE CONTENT. ADVANTAGES OF EACH PROCEDURE ARE DISCUSSED. /AUTHOR/

  • Supplemental Notes:
    • Hpr, 3-8-68-118, 118
  • Corporate Authors:

    University of Texas, Austin

    Cockrell Hall
    Austin, TX  United States  78712

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  United States  78701

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Lytton, R L
  • Publication Date: 1969-2

Subject/Index Terms

Filing Info

  • Accession Number: 00237221
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Oct 28 1994 12:00AM