CLAY STRUCTURE AND RATE PROCESS THEORY

An effort was made to incorporate structural variations into rate-process theory by defining a primitive or ideal clay that has a linear strain-time relation implicit in rate-process theory. The slope of the creep curve of the primitive clay is equal to the slope of the tertiary curve at its inflection point. The deviations of the tertiary curve from the straight line are a measure of the behavior of the real clay caused by the structural changes. The ratio of the strain of the real clay to the strain of the primitive clay can be calculated at any point in time. This ratio, defined as the mobilization ratio, is a measure of real-clay structure relative to primitive-clay structure, which remains constant during progressive creep deformations. The method of analysis proposed here reveals that equivalent mobilization ratios correspond to points of identical structure on creep curves. This hypothesis is supported by the experimental results. The analysis of underained simple shear creep tests conducted on grunditeillite clay at various temperatures and shear stresses demonstrates that the rate process parameters--flow volume, activation enthalpy, and proportionality constant--are structure dependent. The structural changes that accompany creep deformations can be expressed in terms of variations in these parameters. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 49-53
  • Monograph Title: Soil taxonomy and soil properties
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00179011
  • Record Type: Publication
  • ISBN: 0309026717
  • Files: TRIS, TRB
  • Created Date: Aug 19 1978 12:00AM