福州市区土层剪切波速与土层深度的经验关系研究

Empirical Relationship between Shear-wave Velocity and Depth of Soils in Fuzhou Downtown Area

摘要:

土层剪切波速是岩土工程勘察和工程地震中重要的土动力学参数。以福州市区常规土类为研究对象，利用大量地震安全性评价工作获得的346个钻孔7 562条实测剪切波速样本数据资料，分别运用一元二次多项式、指数和线性函数拟合方法，对福州市区8种不同典型土体进行土层剪切波速v_S与土层深度H间的相关性统计回归，并以拟合优度为评价指标来考虑适用模型参数。结果表明，除卵石外，福州市区土层剪切波速与土层深度间的相关性较为明显，一元二次多项式函数的适用性更强。研究结果可供福州市区无场地剪切波速数据时参考使用。

Abstract:

The shear-wave velocity of soils is an important soil dynamic parameter in geotechnical engineering investigation and earthquake engineering. First, the data of 7 562 actual shear-wave velocity samples measured from 346 boreholes during the seismic safety evaluation of engineering sites in Fuzhou were collected and analyzed. Then, using three statistical models i.e., quadratic polynomials with one unknown, exponential equation, and linear equation, the respective empirical relationships between shear-wave velocity and depths of eight typical soil types in Fuzhou downtown area were obtained. The results show that there is an obvious relationship between the shear-wave velocity and depth of soils except cobble soil, and the applicability of one of two quadratic polynomials is superior. This research can be used as a reference for sites where shear-wave velocities are not tested in Fuzhou downtown area.