SEISMIC RESPONSE AND LIQUEFACTION OF SANDS-DISCUSSION

This discussion highlights the practical limitations of an analytical technique used for calculating pore pressure increases in unliquified sands under cyclic loading conditions. This technique is limited by difficulties in accurately determining the required soil parameters. In particular, this discussion considers evaluation of change in volumetric strain. The discussor presents three facts about change in volumetric strain: The data sets for the two sands are statistically independant of each other, thus a single relationship is inadequate for estimating values of change is volumetric strain for these two sands, and thus for all sands; because of scatter in laboratory test results, estimates of change in volumetric strain from laboratory data contain considerable uncertainty as shown by the least square analysis; Predicted changes in volumetric change values calculated from the discussors' equations, fit the experimental data reasonably well for some values of cycles for prestrain (n) and function of shear strain (y). In summary , it appears that useful estimates of the parameter of change in volumetric strain for practical applications of the proposed analytical technique can only be abtained from tests on undisturbed samples of sand in question and that even these estimates contain a rather large factor of uncertainty.

  • Availability:
  • Supplemental Notes:
    • Refer to ASCE Proceeding Paper 12316 by KA Aziz and JT Laba, August 1976.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Discussers:
    • Youd, T L
  • Publication Date: 1977-7

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Filing Info

  • Accession Number: 00165897
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13054
  • Files: TRIS
  • Created Date: Mar 29 1978 12:00AM