The writer appreciates the comments and supplementary information provided by Tsotsos and Hatzigogos. The formulation presented in the paper is restricted to undrained loading conditions. For a more general formulation incorporating both drained and undrained loading conditions, the reader is referred to Ref. 26. The discussers raise some questions about the general validity of using a Von Mises yield surface in deviatoric subspace. To answer this question, the writer wishes to emphasize that a yield condition is merely a mathematical concept used to derive the plasticity equations. However, the important plasticity concept used in the formulation is that of the plastic modulus associated with the yield surface, which gives the slope of the stress-strain curve at that particular stress level. The writer agrees with the discussers that a nonassociative flow rule, in general, does more accurately describe the behavior of soils, as shown in Ref. 26. However, experimental results do suggest that an associated flow occurs in the deviatoric subspace as assumed in the presentation, which, again, is restricted to undrained loading conditions. (Author)

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  • Accession Number: 00314637
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13942
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM