太湖地区土层地震反应分析

The Analysis of Seismic Response of Soil Layers for Taihu Lake

通过对太湖地区附近的淤泥、粉质黏土、粉土三类新近沉积土进行动三轴实验,使用合适的拟合公式对土动力实验原始数据进行拟合,并利用时域直接积分方法对太湖附近工程场地进行了土层计算并进行了对比。与等效线性化方法比较发现,在强震动输入时,软弱土体会进入较明显的非线性范围,等效线性化将不能准确模拟土体反应。上述结果指出:类似场地的地震反应分析工作不能完全依赖等效线性化方法,本文也可以作为太湖周边工程场地地震安全性评价工作的一个参考。

Taking the dynamic triaxial experiment of three despoits：silt,silty clay and silty soil near the Taihu region,suitable fitting formula is used to fit the original data of soil dynamic.And time domain method is used to calculate and compare the soil layers near the construction site of Taihu,Comparing with the equivalent linearization method,the soil may enter in obvious nonlinear range and the equivalent linearization can no longer simulate the soil response accurately.Based on the above analysis,seismic response analysis of the similar site can＇t completely depend on the equivalent linearization method,and this paper can be a reference for seismic safety evaluation of Taihu surrounding engineering sites.