【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。更多还原

【Abstract】 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.更多还原