论文部分内容阅读
收集了2008年以来北海市城区44个工程场地地震安全性评价中的土层剪切波速测试资料,采用幂函数模型分别对粘土、粗砂、砾砂、其它土类的土层剪切波速与埋深进行加权回归分析,得到不同土类的模型参数及拟合优度指标(判定系数R2和误差标准差σ),并对回归方程和回归系数进行了显著性检验;最后将土层剪切波速预测值与实测值进行对比,验证回归关系式的合理性和适用性。结果表明:北海市城区土层剪切波速与埋深呈现出较好的幂函数关系,拟合优度均在0.81以上;给出的土层剪切波速回归关系式能较好地预测出不同埋深土层剪切波速,特别是在土层中部和底部推测结果准确性更高,其推测结果可供北海市城区缺乏剪切波速测试资料的场地参考使用。
This paper collected the test data of shear wave velocity in the seismic safety assessment of 44 construction sites in Beihai City since 2008 and used the power function model to analyze the shear wave velocity and the shear wave velocity of clay, coarse sand, gravel sand and other soil layers respectively. Depth regression analysis, the model parameters and goodness-of-fit index (determination coefficient R2 and error standard deviation σ) of different soil types were obtained, and the regression equation and regression coefficient were tested significantly. Finally, The predicted value of wave velocity is compared with the measured value to verify the rationality and applicability of the regression formula. The results show that the shear wave velocity and buried depth of soil layer in Beihai city have a good power function, and the goodness of fit is above 0.81. The regression equation of shear wave velocity of soil layer can predict different well The shear wave velocity of buried deep soil is more accurate, especially in the middle and bottom of soil layer, and its speculation results can be used as reference for the lack of shear wave velocity test data in Beihai urban area.