渤海海域粉质粘土动力学参数的统计分析

Statistical Analysis of Dynamic Parameters of Silty Clay in the Bohai Sea

本文整理了26个渤海海域场地土动力学测试报告,并按埋深分段统计了0至115m深度范围内粉质粘土的动力学参数,即动剪切模量比和阻尼比。然后,将本文统计值与袁晓铭推荐值和施春花统计过的北京地区粉质粘土的动力学参数值进行了比较,发现海域场地土与陆地场地土的动力学参数值存在较大差异。之后,选择渤海海域的两个场地,建立了相应的土动力学模型,分别选取实测值、本文统计值、施春花统计值进行场地地震反应分析,发现本文统计值与实测值的结果符合的较好。在渤海海域场地地震反应分析工作中,某些粉质粘土层难以获得动力学参数时,可以参考本文的统计值。

After reviewing 26 soil dynamic reports of the site soil in Bohai Sea,we conduct a statistical study of silty clay＇s dynamic parameters,including dynamic shear modulus ratio and damping ratio.Then we compare the statistical values with the values proposed by Yuan Xiaoming and by Shi Chunhua respectively,and find that great differences of soil dynamic parameters exist in between ocean site and land site.Finally,we choose two sites in Bohai Sea,and compare the influence of the statistical values and Shi Chunhua＇s values on site seismic response for each site.Our result show that the statistical values fit better than Shi Chunhua＇s values.In the case of that silty clay＇s dynamic parameters are not available within the Bohai sea,it is reasonable to use the statistical values as the reference for sites.