常州市城区土层剪切波速与土层深度关系分析

摘要

结合海侵地质成因,收集了2009年以来常州市城区358个钻孔2691条土层剪切波速测试资料进行统计分析.采用线性vS=a+bH、多项式式vS=a+bH+cH2及幂函数vS=cHd对各类土剪切波速随深度变化进行回归分析,给出各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,并利用实际工程钻孔进行剪切波速预测与检验.检验结果表明,给出的各类岩土体的剪切波速与埋深经验关系是可靠的,可用文中得出的公式对土层剪切波速进行推测,为今后常州市区的工程抗震工作提供可靠的剪切波速值.%Changzhou City is located on the alluvial plain of the Yangtze River Delta,which is cov-ered by relatively thick Quaternary strata.Combining geological origin of transgression,2691 test data on shear wave velocities of soils from 358 boreholes in Changzhou City were collected for statistical analysis.Using the linear VS=a+bH ,the polynomial formula VS=a+bH+cH 2 , and the power function VS=cHd ,regression analysis was performed on the variation in shear wave velocity in different soil types with different soil depths.Three relations between the type of soil and shear wave velocity variation with depth and the corresponding regression parameters are presented.The shear wave velocities were estimated and tested using actual data from engineering boreholes.The results show that the shear wave velocity and soil depth in Changzhou City exhibit a reliable empirical relation.The formulas can be used to predict the shear wave velocity in the study area and provide reliable values for use in future seismic engineering analyses of Changzhou City.