LIQUEFACTION AND CYCLIC MOBILITY OF SATURATED SANDS-DISCUSSION

A plot (presented by the authors) for the preliminary evaluation of cyclic mobility (or liquefaction) potential is compared with plots similar in objectives (given by Seed and Peacock) particularly with regard to the author's lower limit suggests that for standard penetration resistance greater than 40, ground failure is unlikely regardless of the stress ratio. This limiting value corresponds to a relative density of approximately 72 percent. The author's lower limit in terms of relative density is shown in a figure which shows shaking table data corrected for multidirection shaking for five cycles and 30 cycles of stress application respectively. Comparisons suggest that the author's lower limit is more conservative than that of Seed and Peacock for relative densities less than 65 percent. For relative densities less than 60 percent, assigning 30 significant stress cycles to the author's lower limit is resonable and probably conservative. For earthquakes of short duration producting 5 significant stress cycles or less, application of the author's limit is overconservative. Regarding earthquakes producing less than 20 or 30 significant stress cycles, it is recommended that the stress ratio be corrected to a lower value corresponding to 20 or 30 cycles depending on the relative density for the sand deposit in question.

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Filing Info

  • Accession Number: 00141312
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11388 Proceeding
  • Files: TRIS
  • Created Date: Oct 26 1976 12:00AM