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日本地震超高密度实时监测系统(SUPREME)建设中的核心技术之一是依据强震记录对液化场地进行反演识别,系统中目前使用的是Suzuki法,但实际应用效果并不理想。选取不同地震下多种类别场地上的实际地震记录,对Suzuki法的适用性进行了研究,讨论了其不同指标对不同类别场地识别结果的影响。分析表明:Suzuki法对不同类别非液化场地的识别能力不同,最显著的缺陷是易将软土场地与液化场地混淆;方法所使用的4个识别指标中,过零周期为控制参数,其它指标仅起到初判作用;方法出现误判的原因是液化场地的过零周期范围与非液化中软土场地上的过零周期范围存在明显交叉,而这一点理论上是无法避免的客观存在;改进的方法是应放弃现有进行绝对值对比的做法,改用地震动某些参数的相对变化作为新的识别指标。
One of the core technologies in the construction of Japan Super Earthquake Super High Density Real-Time Monitoring System (SUPREME) is the identification of liquefied sites based on strong earthquake records. Suzuki method is currently used in the system, but the actual application effect is not satisfactory. The actual seismic records on different types of sites under different earthquakes are selected to study the applicability of the Suzuki method. The effects of different indexes on the recognition results of different types of sites are discussed. The analysis shows that the Suzuki method has different recognition ability for different types of non-liquefied sites. The most obvious defect is that it is easy to confuse the soft soil site with the liquefied site. Among the four identification indexes used in the method, the zero-crossing period is the control parameter. Other indicators The reason for the misjudgment of the method is that there is a clear cross between the zero-crossing period of liquefaction site and the zero-crossing period of non-liquefaction medium-soft site, which is theoretically an unavoidable objective existence. The improved method should abandon the existing practice of comparing absolute values and use the relative change of certain parameters of ground motions as a new identification index.