基于对武汉后湖地区78个地震安全性评价钻孔地层资料及实测剪切波速数据的分析,根据岩土类型和物理状态将岩土体分为11个组别,并运用线性关系、二次多项式关系、幂函数关系等3种经验公式,分别对各土层的剪切波速(V_s)与深度(H)的关系进行回归分析。得到了武汉后湖地区各土层的回归关系式和相关系数,并分析了导致土层拟合优度差异的原因。结果表明,黏土层(可塑-硬塑)、粉砂质黏土层(稍密、中密-密实)、粉细砂层(稍密、中密-密实)等土层拟合优度较高,相关系数范围为0.71~0.95,可供该地区无波速测试的场地参考使用。

According to the analysis of soil layer and shear wave velocity data of 78 boreholes from seismic safety evaluation reports of Houhu area in Wuhan, we classify rock and soil into 11 groups in terms of rock and soil types and mechanical properties. Furthermore, we carry out regression analysis on the relationship between shear wave velocity and soil depth using 3 empirical formulas inclusive of linear fitting, polynomial fitting and exponential fitting. Finally, we obtain regression formulas and coefficients of different soil layers in Houhu area of Wuhan, and analyze the causes of the difference in fitting accuracy. The result shows that there is high correlation between shear wave velocity and depth of soils in clay layer (plastic and hard plastic), silty clay layer(slightly dense, medium dense, and dense), and fine silty sand layer(slightly dense, medium dense, and dense), with coefficients from 0.71 to 0.95. The empirical relationship of these soils in this paper can be used as a reference for sites in the absence of shear wave velocity test.