STRAIN LOCALIZATION AND UNDRAINED STEADY STATE OF SAND

The authors share test results that characterize the behavior of a loose, fine-grained, water-saturated sand tested under globally undrained conditions in a plane strain apparatus. Stereophotogrammetry, along with local measurement of boundary forces and deformations, is used to track the progressive localization of strain. The constitutive behaviors in the tests prior to localization can be characterized as undrained local softening or undrained load softening and subsequent rehardening. In either case, a consistent pattern of onset of the formation of the persistent shear band, mobilization of maximum effective friction, and the complete formation of the band was noted. Conditions approximating steady state were observed only in the shear bands. The effect of strain localization on the traditionally derived steady-state line was determined to be minimal when undrained load softening behavior was observed, but significantly different steady-state lines resulted from plane strain and axisymmetric tests. The results of plane strain tests are compared with those of triaxial test results to assess the practical implications of observed differences between the two sets of test results.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 462-473
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00726086
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 21 1996 12:00AM