【摘要】 收集天津地区近年来有代表性的具有完整土动力学参数作为实验数据的地震安全性评价报告66份,用两种统计方法按不同深度统计分析粉质黏土、黏土、粉土、砂土、淤泥质土等的实测土动力学参数,给出动剪切模量比和阻尼比平均值。选取2个典型工程场地,构建土层分析模型,进行土层地震反应分析计算。结果表明,本文得到的统计2值在天津地区具有一定的代表性和适用性,与实测值结果更为接近。对于获得原状土样困难的场地,特别是对于较薄的夹层土,可参照统计2结果进行分析计算。更多还原

【Abstract】 The dynamic shear modulus ratio and damping ratio are two important parameters in seismic risk assessment and can directly affect the soil dynamics of engineering sites.The analysis of seismic hazards and soil layer seismic response showed that dynamic soil parameters were the key aspects that influenced the results of the analysis.In this study,66 recent seismic risk assessment reports in the Tianjin area were collected,which contained representative and complete experimental data of soil dynamics parameters.Using two statistical methods,the dynamic parameters of experimental soils in these reports(e.g.,silty clay,clay,silt,sand,silt soil,etc.)were statistically analyzed by depth and the average value of the dynamic shear modulus ratio and damping ratio.Next,the soil analysis models of two representative engineering sites(located at the Tianjin urban district and Tangu suburban district)were developed and the soil layer seismic response was calculated.The analysis showed that the two statistical values were representative and adaptable in the Tianjin area,and were more consistent with the practical measured values.Therefore,the two statistical values that were derived could be used to conduct the soil seismic response analysis for sites in which it was difficult to acquire undisturbed soil samples,especially for the thin interbed soil.更多还原