• 首页关于本刊投稿须知期刊订阅编委会期刊合作查询检索English

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.

 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

DOI：10.11899/zzfy20210215

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：