利用深度回归分析天津市区土体剪切波速

Depth Regression Analysis of Soil Shear Wave Velocity in Tianjin Urban Region

应用数理统计方法分析了天津市78个钻孔,2 212组不同岩土体的剪切波速数据,得到了其区分岩土类型和不区分岩土类型2种情况下最优的剪切波速回归公式,利用所得经验公式对实际钻孔不同深度剪切波速进行了预测,并基于实测结果对预测结果进行了分析。结果表明,天津市区主要岩土类型剪切波速与深度的相关性大小存在较为明显的差异,其中粘土、粉土和粉质粘土的相关性最好,粉砂和细砂次之,人工填土最差;各类主要岩土体剪切波速与埋深之间的相关关系中多项式模型拟合精度最高,给出的各类主要土体剪切波速与埋深经验关系准确可靠,可用于天津市区主要土体剪切波速计算工作。

The shear wave velocity data of 2 212 sets of different soils of 78 drilling wells in Tianjin urban region were analyzed using mathematical statistics method. The optimal regression formulas of shear wave velocity were obtained in the case of considering and ignoring soil types. Then the empirical formulas were used to estimate the shear wave velocity of different depths in the actual drilling, and the estimated results were analyzed basing on the measured results. The results show that, an obvious difference between the correlation of shear wave velocity and soil depth of main soil types are existed in Tianjin urban region, in which the correlations of clay, silt and silty clay are the best, followed by siltstone and fine sandstone, and artificial filled are the worst the fitting accuracy of polynomial models are the highest in all relationships between shear wave velocity and soil depth of main soil types; the given empirical relationships of shear wave velocity and soil depth of different main soil types are accurate and reliable, and they can be used to calculate the shear wave velocity of main soil types in Tianjin region.