苏州深厚场地等效剪切波速与计算深度分析

发布时间：2018-05-28 00:29

  本文选题：场地分类 + 空间分布特征　； 参考：《防灾减灾工程学报》2017年05期

【摘要】：剪切波速是表征土体动力特性的重要参数,通常抗震规范将其作为场地分类的主要指标,但不同规范选取的计算深度有所差异。基于苏州研究区446个钻孔的波速实测资料,统计分析了相对于计算深度20m和30m的等效剪切波速v_(s,20)和v_(s,30)的相关性;依据中国规范、欧盟规范和美国规范给出的场地分类标准,比较了不同抗震规范下苏州研究区场地分类空间分布特征。结果表明:苏州研究区场地的vs,20和vs,30之间存在良好的线性关系,其线性回归分析的决定系数R~2为0.888;中国规范和欧美规范给出的场地分类空间分布的差异性明显,中国规范的Ⅱ类场地分布于研究区西部局部区域、Ⅲ类场地分布于整个研究区、Ⅳ类场地呈零星分布;欧盟规范的CEU类和美国规范的DUS类场地分布于整个研究区,而欧盟规范的DEU类和美国规范的EUS类场地主要分布于与东西向呈23°夹角的一个狭长区带内。
[Abstract]:Shear wave velocity is an important parameter to characterize the dynamic characteristics of soil. The seismic code usually regards it as the main index of site classification, but the calculation depth of different codes is different. Based on the measured data of wave velocities in 446 boreholes in Suzhou Research area, the correlation between the equivalent shear wave velocities of 20 m and 30 m) and VSP / 30) is statistically analyzed, and the classification standards of the sites are given according to the Chinese code, the EU Code and the US Code. The spatial distribution characteristics of site classification in Suzhou study area under different seismic codes are compared. The results show that there is a good linear relationship between vsl20 and vsf30 in Suzhou Research area, and the coefficient of determination of the linear regression analysis is 0.888.The spatial distribution of the site classification given by the Chinese and European codes is obviously different from that of the European and American codes. The type 鈪，

本文编号：1944465