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  丁毅,王玉石,王宁,张立宝.地表/井下反应谱比值非线性统计特征与影响因素研究[J].震灾防御技术,2021,16(2):362-370, DOI:10.11899/zzfy20210215.

地表/井下反应谱比值非线性统计特征与影响因素研究
摘要:    浅地表软弱覆盖层对地震动的影响具有强非线性,但因观测记录样本量过小,难以通过参考谱比法等直接方法予以可靠分析。本文基于日本KiK-net台网136个竖向钻井台阵获取的141881组加速度记录的统计分析,研究了地表/井下反应谱比值随地震动强度变化的非线性变化规律与主要影响因素。利用变窗口尺度的滑动窗口平均法加强数据线性度,并确定了与地震动强度相关的台站最小记录样本量,统计结果表明地表/井下反应谱比值平台值随地震动强度变化的非线性衰减指数为-0.24~-0.08。利用套索(Lasso)算法统计回归发现,本研究12个场地特性表征参数中,30 m平均剪切波速($ {V}_{\mathrm{s}30} $)、场地卓越频率与地表/井下反应谱比值非线性衰减指数具有较好的正相关性;较弱强度地震动作用下地表/井下傅里叶谱比值峰值、地表/井下反应谱比值峰值与地表/井下反应谱比值非线性衰减指数具有较好的负相关性。
作者单位
丁毅 中国地震局地球物理研究所北京 100081 
王玉石 北京工业大学城市与工程安全减灾教育部重点实验室北京 100124
北京工业大学工程抗震与结构诊治北京市重点实验室北京 100124 
王宁 中国地震局地球物理研究所北京 100081 
张立宝 中国地震局地球物理研究所北京 100081 
关  键  词:强震动  局部场地效应  反应谱  非线性  竖向台阵
DOI:10.11899/zzfy20210215
基金项目:国家重点研发计划(2019YFC1511004);国家自然科学基金重点项目(51639006,U1839202)
收稿日期:2021-01-27
作者简介:丁毅,男,生于1996年。硕士研究生。主要从事强震动观测数据分析与应用研究。E-mail:dingyi18@mails.ucas.ac.cn
通讯作者:王玉石,男,生于1982年。博士,副研究员,硕士生导师。主要从事地震动场地效应与强震动观测技术研究。E-mail:wangyushi1982@126.com
Study on Nonlinear Statistical Characteristics of Surface/Downhole Response Spectrum Ratio and Influencing Factors
Abstract:      The influence of shallow soft overburden on ground motion is strongly nonlinear, but it is difficult to make reliable analysis by direct methods such as reference spectral ratio method because of the small sample size of observation records. In this study, based on the statistical analysis of 141881 sets of acceleration records obtained from 136 vertical borehole array in Japan’s KiK-net network, the nonlinear variation of surface/downhole response spectrum ratio and its main influencing factors of field motion intensity were studied. The sliding window average method with variable window scale was used to enhance the linearity of the data, and the minimum sample size related to the ground motion intensity was determined. The statistical results show that the nonlinear attenuation index of ground motion intensity variation is between −0.24 and −0.08 for the platform value of the surface/underground response spectrum ratio. According to Lasso regression statistics, the average shear wave velocity of 30 m ($ {V}_{S30} $) and site predominant frequency have a good positive correlation with the nonlinear attenuation index of surface/downhole response spectrum ratio among the 12 site characteristic parameters studied. However, the peak values of the surface/downhole fourier spectrum ratio and the surface/downhole response spectrum ratio are negatively correlated with the nonlinear attenuation index of the surface/downhole response spectrum ratio under the weak ground motion.
Keywords:  Strong motion  Site effect  Response spectrum  Nonlinear  Vertical borehole arrays
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