PHYSICAL-CHEMICAL PROPERTIES OF EXPANSIVE CLAYS IN RELATION TO THEIR ENGINEERING BEHAVIOUR

SWELLING OF CLAYEY SOILS DEPENDS MAINLY ON THE CONSTITUENT CLAY MINERALS, EXCHANGEABLE BASES AND CONFINING PRESSURES. THE INFLUENCE OF THESE FACTORS WAS STUDIED WITH REGARD TO A WIDE VARIETY OF EXPANSIVE SOILS FOUNDS IN INDIA. THE SWELLING CHARACTERISTICS OF THESE SOILS WERE CORRELATED WITH SINGLE-VALUED CONSTANTS SUCH AS THE LIQUID LIMIT, SHRINKAGE LIMIT, BASE-EXCHANGE CAPACITY, SOIL SUCTION, FREE SWELL AND MONTMORILLONITE CONTENT, WHICH HELP IN PREDICTING THE SWELLING BEHAVIOUR OF THE SOILS. ATTEMPTS WERE ALSO MADE TO VERIFY THE VARIOUS THEORIES ON THE MECHANISM OF SWELLING. WHILE THE GOUY-CHAPMAN DOUBLE-LAYER THEORY DISREGARDS HYDRATION OF IONS AND THAT OF CLAY PARTICLES, THE SCHOFIELD SUCTION-POTENTIAL THEORY FAILS TO ACCOUNT FOR THE CONFINING PRESSURES. TERZAGHI'S ELASTIC THEORY CONSIDERS ONLY MECHANICAL EFFECTS AND CONSPICUOUSLY OVERLOOKS PHYSICO- CHEMICAL EFFECTS IN CLAY SWELLING. EXPERIMENTAL EVIDENCE INDICATES THAT THE DOUBLE-LAYER THEORY, INCORPORATING THE HYDRATION OF CLAY PARTICLES AND EXCHANGEABLE IONS, SHOULD BE COMBINED WITH THE CONCEPTS OF SUCTION POTENTIAL AND ELASTICITY TO PROVIDE A PLAUSIBLE EXPLANATION FOR THE SWELLING PROCESS. /AUTHOR/

  • Supplemental Notes:
    • Vol 1, Div 3, PP 84-89, 11 FIG, 2 TAB, 11 REF
  • Authors:
    • Gupta, S N
    • Gupta, B N
    • Shukla, K P
  • Conference:
  • Publication Date: 1967-9

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Filing Info

  • Accession Number: 00237441
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 19 1994 12:00AM