粘性土剪切波速不确定性的统计分析

Statistical analysis of uncertainty for shear wave velocities of cohesive soils

土体剪切波速具有显著的不确定性。基于全国地震安全性评价工作实测的粘性土的大量剪切波速数据,采用2χ检验方法研究了粘性土不同埋深的剪切波速的概率分布。依据所获得的概率分布,采用相应的统计方法给出了粘性土不同埋深的剪切波速的平均值、最大值、最小值、标准差和变异系数,并给出了95%参考值下限和上限,所获得的结果可用于检验场地剪切波速测试结果的可靠性和粗略估计无实测资料场地土的剪切波速。

Shear wave velocity of soils has significant uncertainty.Based on lots of shear wave velocities of the soils obtained during seismic safety evaluation of engineering sites,probability distribution of shear wave velocity of cohesive soils under different depths is studied using chi-square test method.According to the obtained probability distribution,the mean values,the maxima,the minima,the standard deviations,and the coefficients of variation of the cohesive soil under various depths are given using the statistical method corresponding to the obtained probability distribution,and their upper limits and lower limits of 95% reference are provided.The obtained results can be used to verify the reliability of the results of the shear wave velocities measuring and coarsely estimate shear wave velocities of site soils,of which the shear wave velocities are not tested.