摘要
针对土的动剪切模量比和阻尼比的不确定性对场地震动反应的影响,收集了江苏盐城515组土样作为基础数据对影响其不确定性的因素进行研究。结果表明:各土类动剪切模量比标准差的最大值全部出现在土层地震反应中动剪切模量比最常出现的范围1×10^(-4)~1×10^(-3)之间,且其变异系数在剪应变达到5×10^(-4)时已远超6%;与已有研究对比表明,通过控制土样数据分布与类别的一致性可以有效减小其动力参数的不确定性。在对地质年代变化影响的研究中,发现尽管地质年代对土动力参数的不确定性具有显著影响,但沉积环境等因素对土层动力性能的改变也不可忽视,为土动力参数分析和工程抗震设计提供了数据参考。
In view of the influence of the uncertainty of dynamic shear modulus ratio and damping ratio of soil on the site seismic response,515 groups of soil samples from Yancheng,Jiangsu Province,were collected as basic data to study the factors affecting the uncertainty.The results show that the maximum standard deviation of dynamic shear modulus ratio of each soil type all appears in the range of 1×10^(-4)to 1×10^(-3),which is the most common range of dynamic shear modulus ratio in the seismic response of soil layers,and its variation coefficient exceeds 6%when the shear strain reaches 5×10^(-4).It is shown that the uncertainty of dynamic parameters can be effectively reduced by controlling the consistency of soil sample data distribution and classification.In the research on the influence of geological age change,it is found that although geological age has a significant impact on the uncertainty of soil dynamic parameters,changes in soil dynamic performance due to factors such as sedimentary environment should not be ignored,which provides a data reference for soil dynamic parameter analysis and engineering seismic design methods.
作者
王喆恺
谭慧明
陶小三
WANG Zhe-kai;TAN Hui-ming;TAO Xiao-san(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210024,China;Key Laboratory of Coastal Disaster and Protection of Ministry of Education,Hohai University,Nanjing 210024,China;Jiangsu Seismological Engineering Research Institute,Nanjing 210014,China)
出处
《水道港口》
2023年第2期256-263,共8页
Journal of Waterway and Harbor
基金
国家自然科学基金项目(52078187,51878247)。
关键词
动剪切模量比
阻尼比
不确定性
地质年代
dynamic shear modulus ratio
damping ratio
uncertainty
geologic age
