ANISOTROPY AND STRESS REORIENTATION IN CLAY

The mechanism by which both anisotropy and stress reorientation may cause the undrained strength of clay to vary with orientation of the failure plane are examined. Because the magnitude of the change in stress required to cause undrained failure in clay depends on the amount of reorientation of the principal stress directions, the magnitude of the changes in pore-water pressure, and thus the magnitude of the effective stresses will also depend on the amount of reorientation of the principal stresses. The influence of stress reorientation on the undrained strength may be treated analytically, provided values of the strength parameters in terms of effective stresses and the pore pressure parameters are known which would apply to the various orientations of the principal stresses at failure. Test results show that kaolinite is practically isotropic with respect to the values of the strength parameters in terms of effective stress, but is anisotropic with respect to the values of the pore pressure parameter. A sub f. /AUTHOR/

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  • Accession Number: 00095064
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #4903 Proceeding
  • Files: TRIS
  • Created Date: May 29 1975 12:00AM