预测轻亚粘土液化势的统计公式

本文利用按统计法原理编制的液化势计算程序,分析了三组有代表性的轻亚粘土液化资料（分别含126个点、166个点和231个点）,提出了含4因素和5因素的判别轻亚粘土液化的公式,这些公式的特点是具有明确的保证率。而且当有必要时,还可根据工程的重要性取不同的保证率。通过用不同烈度区典型实例的验证,证明了所提公式的有效性。文末介绍了公式的应用实例。

Formulae for Predicting Liquefaction Potential of Clayey Silt as Derived from a Statistical Method

Clayey Silt is a slightly plastic sandy loam the plasticity index（Ip） of which is between 3~10 and its liquefaction occurred in a large area during Tangshan earthquake on July 28, 1976.Formulae with 4 or 5 primary factors for predicting liquefaction potential of clayey silt are presented in this paper. The formulae are derived after analyzing three groups of representative data of clayey silt （involving 126, 166 and 231 points respectively）by using a special computer program prepared by authors.The characteristic of the formulae is associated with a discrimination ratio for liquefaction and non-liquefaction. In addition,they can also be used to choose certain discriminas-tion ratio based on importance of engineering projects.The validity of the formulae is established through checking typical examples from seismic zone with different intensity. A practical application is also mentioned in the end of the paper.