Evaluating model uncertainty of a CPT-based model for earthquake-induced soil liquefaction

To account for uncertainties in the environmental parameters and model that are required in the calculation of soil liquefaction potential, the probabilistic approaches may be employed. In this paper a new CPT-based Liquefaction Triggering Model (LTM) is arranged using field performance case histories of Moss et al (2006). The model uncertainty, mu(c1) and COV(c(1)) of the LMT is determined by the sampling process taking proportional cases from the group of liquefied cases and the group of non-liquefied cases. However, the probability of liquefaction is calculated considering uncertainties of model and parameters by the Hasofer-Lind reliability index and the KCP (Lee et al, 2007). It is principally when evaluating probability of liquefaction that all (the model and parameter) uncertainty considered differs significantly from earlier and widely used only parameter uncertainty considered.