水泥土强度变异性统计分析

水泥土具有较高的变异性，而水泥土搅拌桩的现有设计理论均采用确定性的设计方法，没有考虑水泥土强度的离散性。基于已有文献数据，并结合实体工程试验数据，统计分析了水泥土强度的变异性。结果表明:水泥土强度设计值随变异系数的增大而减小，变异系数在0.20~0.79之间，平均为0.416；强度的分布规律近似满足正态分布或对数正态分布。建议在设计计算中水泥土强度变异系数取值为0.25~0.60。

Statistical Analysis on Variability of Strength of Cement-soil

Cement-soil has high variability, however the current design theories used by cement-soil mixing pile are of certainty, without any consideration discreteness of cement-soil's strength. Based on the existing documented data and combined with the test data from physical works, statistical analysis was carried out in relation to the variability of strength of cement-soil. The result shows that as increase of the coefficient of variation, the design value of the strength of cement-soil decreases, and the coefficient is between 0.2~0.79, with the average of 0.416; the law of the strength distribution approximately meets normal distribution or logarithmic normal distribution.It is suggested that the coefficient of variation takes 0.25~0.6 in the design calculation.