A FAMILY OF YIELD LOCI BASED ON MICRO MECHANICS

概要

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This paper examines a recently proposed work equation which accounts for energy dissipated in particle fracture and frictional rearrangement. A simple approach is adopted whereby the relative proportion of plastic work dissipated in fracture and friction is a simple function of stress ratio, and the normality principle is applied to generate a new family of yield loci. The derived family of yield loci requires the specification of a single parameter in addition to the critical state friction dissipation constant, and the original Cam clay yield locus is shown to be a special member of this family. By selecting an appropriate value of the new parameter, it is possible to model many of yield surfaces commonly encountered for isotropically consolidated clays and sands. The method also provides a convenient way of rounding off the corner of the Cam clay yield locus, if that is all that is required. The approach is useful in that it warns against use of the new yield loci on the dry side of critical states : for this purpose a non-continuum approach should be used. Care should also be taken in applying the normality principle : for sands at high stress ratios, extensive particle rearrangement occurs, in which case a non-associated flow rule could be adopted with the new family of loci.
社団法人地盤工学会の論文
2000-12-15