大连地区场地土动力学参数初步研究

Research on dynamic parameters of soil site in Dalian area

摘要:

通过收集近年来大连地区地震安全性评价报告中土动力学参数的实验资料,统计分析粉质粘土、淤泥质粉质粘土、粘土、中砂、碎石、回填土和全风化板岩等7类土的实测动力学参数,给出了它们的动剪切模量比和阻尼比的统计值。然后,选取典型钻孔并建立了土层地震反应分析模型,分别运用本文统计值、94规范值(即原大连地震小区划的土动力学参数值)和袁晓铭等(2000)的推荐值进行土层地震反应计算,并将计算结果中的地表峰值加速度和反应谱形状进行了比较。结果表明,本文的统计值与袁晓铭等(2000)的推荐值非常接近,而与94规范值有很大的差别。

Abstract:

In this paper, soil dynamic parameters from Dalian area seismic risk assessment reports are collected. The tested data are divided into 7 kinds of type, i. e. silty clay, muddy silty clay, clay, sanely soil, sand stone, return soil and all-weathered slate. Statistics of the dynamic parameters of soil has been done to obtain the mean values of dynamic shear modulus ratio and damping ratio. Then a typical drilling is selected to establish soil dynamic models in order to investigate the seismic response in different cases. The results show that the statistical values are close to values recommended by Yuan Xiaoming, et al ( 2000) , but have some deviation from standard values in 94 code.