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国家规范中液化判别特征深度的适用性研究

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Keywords: 砂土液化,砂层特征深度,抗震规范

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Abstract:

我国抗震规范砂土液化初判条件中,若砂层上覆土层深度超过特征深度即判为不液化或不考虑液化影响,利用近期地震液化调查数据对其适用性进行了检验。采用1995年日本阪神地震和1999年台湾集集地震的液化调查资料,发现我国规范液化判别特征深度取值会产生不可忽视的误判,而造成偏于危险的结果;采用2011年新西兰Ms6.3级地震液化调查资料,初步估计按我国规范液化判别特征深度取值会将65%的液化场地判为非液化场地,严重偏于危险。因此我国规范液化初判条件液化特征深度取值已不适用,需要研究改进。

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