摘要
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。
Based on data of shear wave velocities measured from 44 engineering sites during the seismic safety evaluation since 2008, the paper does the weighted regression analysis for shear wave velocity and depth of soils with various of soil type, including clay, coarse sand, gravelly sand, et al, by using the power-law function,and gets the model parameters and goodness of fit（coefficient of determination R2 and error standard deviationσ）. Meanwhile, the paper tests the significance on regression equation and regression coefficient. Finally, the paper verifies the rationality and applicability of the regression equations via comparing measured values with the predicted values. The results show that there are remarkable relationships between the shear wave velocities and the depths of soils in beihai, which can be fitted by the power function and has the goodness of fit more than0.81; the speculation equations can well speculate soil shear wave velocity in different depth, which is more accurate especially in the middle and bottom soil, and may provide reference for shear wave velocity at sites without the test data in urban areas of Beihai.
出处
《华南地震》
2015年第3期40-45,共6页
South China Journal of Seismology
基金
广西地震局地震科研监测预报合同制课题(091405)
关键词
回归分析
北海市城区
剪切波速
土层埋深
Regression analysis
Beihai City
Shear wave velocity
Soil depth
