盐城市城区土层剪切波速与土层深度相关性分析  

Correlation Analysis between Shear Wave Velocity and Soil Layer Depth in Urban Area of Yancheng City

作　　者：王金艳[1] 陶小三[1] 王琛[1] 邵斌 徐烨 WANG Jinyan;TAO Xiaosan;WANG Chen;SHAO Bin;XU Ye(Jiangsu Earthquake Agency,Nanjing 210014,China)

机构地区：[1]江苏省地震局,江苏南京210014

出　　处：《防灾减灾工程学报》2024年第5期1193-1201,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省地震局科研基金(2024002);中国地震局地震科技星火计划攻关项目(XH24013B);江苏省地震局情景地震构建与应用创新团队(2022-03)资助。

摘　　要：剪切波速是评价土体力学性质的一个重要参数。为分析盐城市城区土层剪切波速与土层深度之间的相关性。收集了盐城市城区场地地震安评和区域性地震安全性评价工程中384个钻孔29925条剪切波速,对剪切波速度与土层深度数据进行处理,采用线性、多项式及幂函数3种模型对4类土剪切波速随深度变化进行回归分析,给出了4类土剪切波速随深度变化的三种关系式及相应的回归参数。将三种模型计算得到的剪切波速预测值及实测值进行对比分析与检验。结果表明,盐城市城区土层的剪切速度随着土层深度的增加而增加,拟合优度均在0.80以上,Ⅲ类场地粘土的相关性系数达到0.949;给出的各类岩土体的剪切波速与土层深度经验关系模型较为可靠,预测精度均较高。研究结果可供盐城城区无场地剪切波速数据时参考使用。Shear wave velocity is an important parameter for evaluating soil mechanical properties.This study aims to analyze the correlation between shear wave velocity and the soil layer depth in the urban area of Yancheng City.A total of 29,925 shear wave velocity data points from 384 boreholes in seismic safety assessments and regional seismic safety evaluation projects in Yancheng were collected.The relationship between shear wave velocity and soil layer depth was analyzed using three types of regression models:linear,polynomial,and power functions.Regression analysis was performed on four types of soil to understand the variation of shear wave velocity with depth,resulting in three corresponding equations and regression parameters for these soil types.The predicted shear wave velocity calculated from the three models was compared with the measured values for verification.The results showed that the shear wave velocity of the soil layer in the urban area of Yancheng increased with the increase of the soil layer depth,with all models achieving a goodness of fit above 0.80,and the correlation coefficient for class Ⅲ clay reaching 0.949.The empirical relationship models between shear wave velocity and soil layer depth for various types of rock and soil provided in this study are reliable,with high prediction accuracy.These findings can serve as reference when shear wave velocity data for sites in Yancheng urban area is unavailable.

关 键 词：盐城市 剪切波速 土层深度 回归分析 

分 类 号：TU443[建筑科学—岩土工程]