STRESS STATE VARIABLES FOR UNSATURATED SOILS

The discusser, Bloch, has provided insight into the difficulties associated with considering an unsaturated soil as having "interacting species." All the criticisms raised by the discusser relate to the assumption made by the writers that an unsaturated soil can be considered as a chemically inert mixture. Once this assumption is made, the equilibrium free energy analysis reverts to a multiphase Newtonian type stress analysis. The writers have no intention of "giving a cold shoulder to the chemical potential in soil mechanics." However, it is clear that saturated soil mechanics has been successful in practice without considering the chemical potential of the soil. The one stress variable (i.e. (sigma-u sub w))for a saturated soil assumes that the soil is a chemically inert mixture. Mitchell indicates how the stress state variable can be extended to consider chemical activity. The writers believe that unsaturated soil mechanics can also be successfully developed by assuming the soil is a chemically inert mixture in a manner that parallels saturated soil mechanics. This is a necessary first step before attempting to embrace even more complex phenomena. /Author/

  • Availability:
  • Supplemental Notes:
    • Discussion from the Proc. Paper 12919, May 1977.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Discussers:
    • FREDLUND, D G
    • MORGENSTERN, N R
  • Publication Date: 1978-11

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Filing Info

  • Accession Number: 00194262
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM