This paper presents a study of liquefaction analysis at sand layers of the Izumio site, under ground motion variation during a strong earthquake in Osaka, Japan. Site investigation using standard penetration test and shear wave velocity measurement is conducted. Finite element liquefaction site response analysis integrated with a strain space multiple mechanism model is conducted. Ground motions variation is considered based on the seismic record at surrounding seismic stations. Attenuation analysis is conducted to determine the scaling factor for ground motions. Several results, such as acceleration profiles and cyclic behaviours are presented. The empirical analysis is also conducted to verify the results of the numerical analysis. The results explained that cyclic behaviours of sandy layers in the Izumio site show the liquefaction tendency. The results also showed that sandy layers are indicated as critical layers during the strong earthquake due to the excess pore water pressure reaching the liquefaction threshold. The results of the empirical analysis also present liquefaction indication at sand layers under the variation of ground motion, since the factor of safety against liquefaction is less than 1. The results are generally well-agree with liquefaction evidence and prediction presented in the previous study. The results could bring practical importance in understanding liquefaction potential in the study area.

本文介绍了日本大阪市强地震期间 Izumio 遗址沙层液化分析的研究。使用标准穿透测试和剪切波速度测量进行现场调查。进行了结合应变空间多机制模型的有限元液化现场响应分析。基于周围地震台站的地震记录考虑地震动变化。进行衰减分析以确定地面运动的比例因子。给出了几个结果，例如加速度曲线和循环行为。还进行了实证分析以验证数值分析的结果。结果解释了泉尾遗址砂层的循环行为表现出液化倾向。结果还表明，由于超孔隙水压力达到液化阈值，沙质层被指示为强震期间的关键层。经验分析的结果还显示了地震动变化下砂层的液化迹象，因为液化安全系数小于1。结果与先前研究中提出的液化证据和预测基本一致。该结果可能对了解研究区的液化潜力具有实际意义。经验分析的结果还显示了地震动变化下砂层的液化迹象，因为液化安全系数小于1。结果与先前研究中提出的液化证据和预测基本一致。该结果可能对了解研究区的液化潜力具有实际意义。经验分析的结果还显示了地震动变化下砂层的液化迹象，因为液化安全系数小于1。结果与先前研究中提出的液化证据和预测基本一致。该结果可能对了解研究区的液化潜力具有实际意义。