【摘要】 研究具有代表性的Kostadinov and Yamazaki液化识别方法的可行性,特别是对软土和液化场地的识别能力。选择包含了13个软土场地的52个场地实际地震纪录,分析结果表明,该方法识别成功率随场地类别变软而显著降低,对中硬、中软和软土非液化场地成功率分别为100%、70.6%和46.2%,对液化场地成功率为62%,对软土和液化场地会出现明显误判。方法中起控制作用的是平均瞬时频率MIF,能很好识别非液化的中硬场地,但难以区分软土场地和液化场地;混淆软土和液化场地的原因是采用平均瞬时频率MIF为绝对量,不符合液化对场地地震动影响的物理本质,建议采用相对量,可能会有好的效果。更多还原

【Abstract】 Feasibility of the Kostadinov and Yamazaki liquefaction detection method is analyzed,especially for detecting soft sites and liquefied sites.Fifty-two actual seismic records that include thirteen non-liquefied soft sites are chosen.The analysis results show that the success rate of the method to identify non-liquefied medium hard,medium soft and soft sites are 100%,70.6% and 46.2% respectively,and the success rate to identify liquefied sites is 62%.Obviously,the method misjudges soft sites and liquefied sites.The control parameter of the method is mean instantaneous frequency(MIF) which can well recognise non-liquefied hard sites,but can not distinguish non-liquefied soft sites and liquefied sites.Since MIF is an absolute value and incapable of capturing the physical nature of ground motion influence caused by liquefaction,a relative parameter is suggested and may be of better effect.更多还原