本文主要以Ⅱ类场地为例,基于不同深度段粘性土层(10m以上;10m～18m;18m以下粘性土层)的动剪切模量比初始试验基准值,增加或减小其基准数值的10％,20％以及30％,其它计算输入参数不变,进行了57种工况下的土层地震反应分析计算.通过该场地条件下的不同工况的地表加速度峰值结果,以及相应工况下地表加速度反应谱的绘制,对比不同工况下的地表加速度峰值与地表加速度反应谱形态,并与实际场地土层地震反应分析模型的计算结果进行对比分析,初步得出不同深度段粘性土层的动剪切模量比的不确定性对场地地表加速度峰值与反应谱影响的规律性.%In this study,take two-class site for instance,based on initial test value of dynamic shear modulus ratio of clay soil layer at different depths (more than 10m,10m-18m,18m below),the test values of 10％,20％ and 30％ are increased or decreased,and other input parameters are the same,the soil seismic response analysis of 57 kinds of working conditions are conducted.Through results of ground motion acceleration peak and ground acceleration response spectrum of different working conditions,the acceleration peak and response spectrum of different working conditions are contrasted,and compared with calculation results of practical soil layer seismic response analysis.The effects of uncertainty of dynamic shear modulus ratio of clay soil layer at different depths on ground motion acceleration peak and ground acceleration response spectrum are preliminarily concluded.
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