Correlation Analysis between Shear Wave Velocity and Soil Layer Depth in Urban Area of Yancheng City
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 re-gression 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 corre-sponding 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 correla-tion 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.