The paper describes a study of the influence of the plasticity index (PI) on the cyclic stress-strain parameters of saturated soils needed for site-response evaluations and seismic microzonation. The paper includes ready to use charts showing the effect of PI on the location of the modulus reduction curve, G/G sub max versus cyclic shear strain, gamma sub c, and on the material damping ratio lambda versus gamma sub c curve. The charts are based on experimental data from 16 publications encompassing normally and overconsolidated clays as well as sands. It is demonstrated that PI is the main factor controlling modulus reduction curve and lambda for a wide variety of soils. The influence of PI on the rate of modulus degradation with the number of cycles in normally consolidated clays is also demonstrated. The study concluded that soils with higher plasticity tend to have a more linear cyclic stress-strain response at small strains and to degrade less at larger gamma sub c than soils with a lower PI.

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 89-107
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00603295
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Jan 31 1991 12:00AM