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为研究输入界面确定对典型场地地震动参数特性的影响,以一个典型场地为例,利用一维等效线性化方法,计算了输入界面选择在软弱夹层土上下不同位置的地表加速度反应谱;并将地表反应谱用2010规范谱形式拟合成场地相关标准谱;分析了输入界面选择在软弱夹层上下不同位置对地震动参数特性的影响,同时比较了标准谱和2010规范谱。结果认为:输入界面应该选择在软弱夹层以下钻孔揭示的波速最大的土层顶面,现场钻探应该贯穿软弱夹层及硬夹层,达到稳定的坚硬土层。
In order to study the effect of input interface on the characteristics of ground motion parameters of a typical site, taking a typical site as an example, the one-dimensional equivalent linearization method is used to calculate the surface acceleration response spectrum of the input interface at different locations above and below the weak interlayer soil. The surface response spectra were fitted to site-related standard spectra using 2010 gauge spectra. The influence of input interface selection on the characteristics of ground motion parameters at different locations above and below the weak interlayer was analyzed, and the standard spectra and the 2010 specification spectra were compared. The result shows that the input interface should select the top of the soil layer with the highest wave speed which is revealed by drilling below the weak interlayer. The drilling on site should penetrate the weak interlayer and the hard interlayer to reach a stable and hard soil layer.