基于剪切波速的地震液化概率性评估方法综述  

Analysis of offshore ground motion characteristics at different sourcelocations based on measured records

作　　者：尹华杰 YIN Huajie(Jiangxi Provincial Transportation Construction Quality and Safety Assurance Center,Nanchang 330096,China)

机构地区：[1]江西省交通建设工程质量安全保障中心,江西南昌330096

出　　处：《世界地震工程》2025年第2期160-172,共13页World Earthquake Engineering

基　　金：国家自然科学基金项目(52370128)。

摘　　要：剪切波速作为土体的重要参数,为地震液化提供了预测依据,但在实际应用中存在局限性。回顾了现有以剪切波速为依据的液化概率判别公式,以液化历史数据为评估样本,对比代表性公式在不同概率水平、不同烈度,以及不同细粒含量情况下的二分类判别结果,分析各公式评估性能。分析表明:各代表性公式目前评估结果展现了一定的统一性;在50%概率水平下,各公式整体正确率在80%左右;在15%概率水平作为临界线下,各公式均保守地分离了绝大多数液化案例,但在85%概率下,各公式对非液化点的分离均低于平均;不同烈度下,上述公式的准确性在低烈度区整体高于高烈度区,在低烈度区偏危险,在高烈度区偏保守;不同细粒含量下,上述公式在细粒含量35%以下差异很小,在35%以上差异显著;此外,判别公式多基于有限且高度重合的地震液化案例数据库,限制了现有公式的普适性。Due to the great influence of geological structures such as terrain and site conditions on ground motion,it has been found that the propagation path of seismic waves has a significant influence on ground motion characteristics.Considering the complex geologic structure of the seabed site and the existence of seawater layer,the ground motion propagation path may also have a great influence on the seabed ground motion.Therefore,the measured strong motion records of the Japanese K-net station located near the shore were collected and divided into two groups,the source is located in the sea area and the land area.Based on the measured motion records,the influence of the source location on the offshore ground motion was analyzed.The high quality offshore motion records in recent years are studied and collected.The difference of vertical-to-horizontal peak acceleration ratio,significant duration,amplification coefficient spectrum,vertical-to-horizontal acceleration response spectrum(V/H ratio spectrum),strength reduction factor spectrum and tripartite plot of response spectrum characteristics of offshore ground motion at different source location is compared.The results show that the seismic source location has a great influence on the characteristics of offshore ground motion.When the seismic source location is seabed,the peak acceleration of offshore ground motion is greater.When the seismic source is located on land,the long period components of the offshore ground motion amplification coefficient spectrum are more pronounced.

关 键 词：剪切波速 概率 液化 烈度 细粒含量 

分 类 号：P315.9[天文地球—地震学]