Liquefaction criteria based on statistical and probabilistic analyses

ABSTRACT

Probabilistic procedures for evaluating liquefaction resistance have the advantage of allowing an acceptable level of risk to be specified by the user. Liao and his colleagues used a logistic procedure to develop probabilistic CRR curves. The original Seed and Idriss magnitude scaling factors, however, we ussed to correct for magnitude. Youd and Noble (herein) use the logistic procedure to analyze liquefaction resistance with a magnitude added as an independent variable. New case history data and (N) were added to enlarge the case history data set. Primary conclusions from the study are The probabilistic procedure allows direct incorporations of an appropriate probability, or risk factor in liquefaction hazard analyses.- The analyses by Liao and his collegegues indicate, for clean sands, that the standard criteria from the simplified procedure provides a probability of occurrence of about 20