Study on the Relationship Between Sedimentary Characteristics of Shallow Soil Layer and Shear Wave Velocity in Qingdao

Abstract

Based on the histogram and shear wave velocity data of 449 boreholes in the Jiaozhou Bay area of Qingdao, the empirical relationship between soil depth and shear wave velocity is calculated. The empirical relationship and sedimentary environment characteristics are analyzed. In connection with the soil layer, which has a long transport distance and a relatively small particle size, the shear wave velocity is relatively low. The empirical relationship between depth and shear wave velocity in the depth of 20m depth of the soil layer with obvious sedimentary features in the Jiaozhou Bay area of Qingdao is given. For the soil layer without obvious sedimentary features, the sedimentary features of the remaining strata of the borehole are used for classification, which improves the fitting degree of the empirical relationship and reduces the error, thus giving a method to estimat shear wave velocity of borehole using bore histogram with obvious sedimentary characteristics. Keywords—Sedimentary Characteristics , Shear Wave Velocity,Statistical Analysis 摘要—以青岛环胶州湾地区 449 个小区划钻孔的柱状图和 剪切波速数据为基础,统计了土层埋深与剪切波速之间的经验 关系特征,分析了该经验关系与沉积环境特征的联系,认为搬 运距离较长、颗粒相对较小的土层,其剪切波速相对较小。给 出了青岛环胶州湾地区沉积特征明显土层在 20m 深度范围内 深度与剪切波速的经验关系。对于沉积特征不明显的土层,使 用其所在钻孔的其余地层的沉积特征进行分类,提高了其经验 关系拟合度,减小了误差,从而给出了一种根据具有明显沉积 特征土层测井数据估算未测波速钻孔的等效剪切波速的方法。