微动信号的数据处理与岩土频谱特性分析
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摘要
频谱是微动信号的一个重要动力学参数,微动信号的频谱特性与场地覆盖层厚度和地基土刚度的变化密切相关,既可反映岩土层的类型特征,又能反映工程场地的动力特性。详细探讨了目前较为常用的利用微动信号进行场地动力特性分析的方法,并对这些方法进行了研究和比较。简要介绍了功率谱估计方法,同时,通过实例分析了微动信号的变化规律和场地微动信号的频率响应特性。
Frequency spectrum is one of the most important dynamical parameter for microtremor.Frequency spectrum characteristics of microtremor signal is closely related to the thickness of ground covering layer and the stiffness variation of overburden layer,which can reflect not only the type characteristic of rock and soil layer,but also the dynamic characteristic of project site.The current method that analyzing commonly the dynamic characteristic of site by microtremor signal has been discussed,researched and compared in detail.Meanwhile,the diversification rule has been analyzed through example;and the estimation of power spectrum and the frequency response characteristic of micro-tremor signal to the site rock and soil mechanism are introduced deeply.
Frequency spectrum is one of the most important dynamical parameter for microtremor.Frequency spectrum characteristics of microtremor signal is closely related to the thickness of ground covering layer and the stiffness variation of overburden layer,which can reflect not only the type characteristic of rock and soil layer,but also the dynamic characteristic of project site.The current method that analyzing commonly the dynamic characteristic of site by microtremor signal has been discussed,researched and compared in detail.Meanwhile,the diversification rule has been analyzed through example;and the estimation of power spectrum and the frequency response characteristic of micro-tremor signal to the site rock and soil mechanism are introduced deeply.
引文
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[2]简文杉,李哲生.福建沿海地区地微动的谱结构特征[J].工程地质学报,2003,10(2):216-219.JIAN Wen-bing,LI Ze-sheng.On the spectral characteristics of ground microtremor in coastal area of Fujian[J].Journal of Engineering Geology,2003,10(2):216-219.
[3]高广运,吴世明,周健,等.场地卓越周期的讨论与测定[J].工程堪察,2000,(5):29-31.GAO Guang-yun,WU Shi-ming,ZHOU Jiang,et al.Discussion and measurement of site predominant period[J].Geotechnical Investigation and Surveying,2000,(5):29-31
[4]陶夏新,刘曾武,郭明珠,等.工程场地条件评定中的地脉动研究[J].地震工程与工程振动,2001,21(4):18-23.TAO Xia-xin,LIU Zeng-wu,GUO Min-zu,et al.A review of microtremor study in engineering site rating[J].Earthquake Engineering and Engineering Vibration,2001,21(4):18-23.
[5]王振东.微动的空间自相关法及其实用技术[J].物探与化探,1986,10(2):123-133.WANG Zhen-dong.The micromotional spatial autocorrelation method and its practical technique[J].Geophysical and Geochemical Exploration,1986,10(2):123-133.
[6]AKI K.Space and time spectra of stationary stochastic waves,with special reference to microtremors[J].Bulletin of Earthquake Research Institute,1957,(35):415-456.
[7]中国建设部综合勘察研究院.CECS74:95场地微振动测量技术规程[S].北京:中国计划出版社,1996:1-5.
[8]HORIKE M.Inversion of phase velocity of long-period microtremors of the S-wave velocity structure down the basement in urbanized areas[J].Journal of Physics of the Earth,1985,33(2):59-96.
[9]SHAPIRO N M,CAMPILLO M,STEHLY L,et al.High-resolution surface-wave tomography from Ambient seismic noise[J].Science,2005,307:1615-1618.
[10]王兴泰.工程与环境物探新方法新技术[M].北京:地质出版社,2001:129-133.
[11]孙小鹏,冯伯林,张战怀.深软土场地上高层住宅的地震安全性问题[J].地震学刊,1999,(3):1-5.SUN Xiao-peng,FENG Bo-lin,ZHANG Zhan-huai.Seismic safe problem of high building on deep soft site[J].Journal of Seismology,1999,(3):1-5.
[12]许建聪,孙红月.地脉动作用下的岩土动力响应研究[J].振动工程学报,2004,(6):147-152.XU Jian-cong,SUN Hong-yue.Study on dynamical response of ground soil to micro-tremor[J].Journal of Vibration Engineering,2004,(6):147-152.
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