Liquefaction Potential Index: A Critical Assessment using Probability Concept

David Kun Li ； C. Hsein Juang ； Ronald D. Andrus

《Journal of GeoEngineering》 1卷1期 (2006/08) Pp. 11-24

https://doi.org/10.6310/jog.2006.1(1).2

並列摘要

Liquefaction potential index (IL) was developed by Iwasaki et al. in 1978 to predict the potential of liquefaction to cause foundation damage at a site. The index attempted to provide a measure of the severity of liquefaction, and according to its developer, liquefaction risk is very high if IL ＞ 15, and liquefaction risk is low if IL ≤ 5. Whereas the simplified procedure originated by Seed and Idriss in 1971 predicts what will happen to a soil element, the IL predicts the performance of the whole soil column and the consequence of liquefaction at the ground surface. Several applications of the IL have been reported by engineers in Japan, Taiwan, and the United States, although the index has not been evaluated extensively. In this paper, the IL is critically assessed for its use in conjunction with a cone penetration test (CPT)-based simplified method for liquefaction evaluation. Emphasis of the paper is placed on the appropriateness of the formulation of the index IL and the calibration of this index with a database of case histories. To this end, the framework of IL by Iwasaki et al. is maintained but the effect of using different models of a key component in the formulation is explored. The results of the calibration of IL are presented. Moreover, use of IL is extended by introducing an empirical formula for assessing the probability of liquefaction-induced ground failure.

並列關鍵字

liquefaction ； earthquakes ； cone penetration test ； case histories ； liquefaction potential index ； factor of safety ； probability of liquefaction