三种非线性时变识别方法的对比研究* —以2021年日本福岛地震为例
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苏州科技大学土木工程学院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Comparative study on three nonlinear temporal changes identification methods - A case of 2021 Fukushima earthquake in Japan
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School of Civil Engineering,Suzhou University of Science and Technology

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    本文利用2021年日本福岛地震(MJMA 7.3)中6个KiK-net 台站的观测记录,分别基于移动窗解卷积法、移动窗谱比法和移动窗自相关函数法对场地非线性时变过程进行了研究。分析了非线性发生的阈值和程度。研究表明: 三种方法识别场地非线性时变特征的稳定性不同。移动窗解卷积法更容易获得较为稳定的土体非线性时变过程,但其反映的是地表至井下平均波速的变化,识别的非线性程度偏低。对于浅表层存在强波阻抗比的土体,移动窗谱比法和移动窗自相关函数法可以获得更强的非线性程度,对于浅表层不存在强波阻抗比的土体则不容易识别出稳定的非线性时变过程。三种方法识别的非线性最强时刻基本一致,皆位于整条记录加速度峰值附近。 基于三种方法识别的6个台站的非线性阈值约在40~140gal之间,剪切波速下降比在16~53%之间,场地非线性较强。

    Abstract:

    Based on the records of 6 KiK-net stations in the 2021 Fukushima earthquake (MJMA 7.3),the nonlinear temporal change process of the site is studied based on the moving time window deconvolution method,the moving time window spectral ratio method and the moving time window autocorrelation function method. The threshold and degree of nonlinearity are analyzed. The results show that the stability of the three methods is different. Moving time window deconvolution method is easier to obtain a more stable nonlinear temporal change process of soil,but it reflects the change of average wave velocity from surface to underground,result of low degree of nonlinearity. For the soil with strong wave impedance ratio in the shallow layer,the moving time window spectral ratio method and moving time window autocorrelation function method can obtain a stronger degree of nonlinearity. However,for the soil without strong wave impedance ratio in the shallow layer,it is not easy to identify the stable nonlinear temporal change process by these two methods. The strongest nonlinear moments identified by the three methods are basically the same, which are located near the peak acceleration of the whole recording. The nonlinear threshold values of the six stations identified by the three methods are about 40~140gal,and the shear wave velocity drops between 16~53%,indicating strong site nonlinearity.

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  • 收稿日期:2021-11-10
  • 最后修改日期:2022-01-02
  • 录用日期:2022-03-11
  • 在线发布日期: 2022-11-10
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