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基于台阵观测的基岩地震动入射波分离方法及数值验证 被引量:1

Seismic incident wave separation method based on array observation and numerical verification
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摘要 基岩地震动的准确输入对复杂场地地震效应特性评价结果的合理性具有重要影响。采用重启动-迭代的方式将基岩观测记录中包含的入射波与下行波分离,并将入射波作为输入信号转换为等效节点力与黏弹性边界组合作为地震动输入形式和基岩边界条件,提出了一种可用于场地数值模拟分析的入射波分离方法。采用日本KiK强震观测台网的IKRH01台阵进行数值验证,将该方法与现有直接节点力输入方法、加速度输入方法对比,并引入井上/井下谱比法从频域分析场地放大效应,结果表明:(1)入射波分离方法可以分离台阵基岩处入射波并实现地震动的精确输入;(2)采用入射波分离方法得到的谱比值与台阵观测谱比的2~6阶波峰吻合较好,说明该方法能有效模拟地震场地反应;(3)对比考虑与不考虑下行波的谱比,发现0~10 Hz以内井上/井下谱比主要受下行波干涉影响,入射波引起的场地放大效应并不显著。 The accurate input of bedrock ground motion has a significant impact on the rationality of the evaluation results of seismic effect characteristics in complex sites.The restart-iteration method is used to separate the incident wave from the downgoing wave contained in the bedrock observation record,and the incident wave is converted into the equivalent nodal force and viscoelastic boundary as the input form and the bedrock boundary condition.The seismic incident wave separation method is proposed which can be used in the site numerical simulation analysis.The IKRH01 array of KiK-NET strong earthquake observation network in Japan is used for numerical verification,and the method is compared with the existing direct nodal force input method and acceleration input method,and the site amplification effect is analyzed from the frequency domain by surface-to-borehole spectral ratio method.The results show that:1) The incident wave separation method can separate the incident wave at the bedrock of the array and achieve accurate input of ground motion.2) The spectral ratio obtained by the method of incident wave separation is in good agreement with the peaks of order 2-6 observed by the array,indicating that the method can effectively simulate the seismic site response.3) By comparing the spectrum ratio of downgoing wave with or without consideration,it is found that the surface-to-borehole spectral ratio within 0-10 Hz is mainly affected by downgoing wave interference,and the site amplification effect caused by incident wave is not significant.
作者 阮滨 吉瀚文 王苏阳 贺鸿俊 苗雨 RUAN Bin;JI Han-wen;WANG Su-yang;HE Hong-jun;MIAO Yu(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)
出处 《岩土力学》 EI CAS CSCD 北大核心 2022年第9期2615-2623,2642,共10页 Rock and Soil Mechanics
基金 国家自然科学基金项目(No.51908237,No.51978304,No.52008184) 中国博士后科学基金特别资助项目(No.2021T140237) 中央高校基本科研业务费专项资金资助(No.2020kfyXJJS114)。
关键词 入射波分离 场地反应模拟 场地效应 台阵观测 数值模拟 incident wave separation site response simulation site effect array observation numerical simulation
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