深圳地区软粘土变形参数研究

根据深圳地区15个软土处理工点的4000多组试验数据,对软土的物理指标和变形指标进行统计分析。结果表明:压缩系数、变形模量和压缩指数的变异系数很大,其算术平均值的误差较大,不宜直接用于工程计算;含水量的变异系数很小,且与压缩参数有良好的相关性,可以较好地推算软土变形参数。因此,建议在实际工程中,如果没有软土的变形实验数据,可以直接根据软土的含水量进行估算;对于有实验数据的情况,将实验得到的变形参数和根据土样含水量估算的变形参数进行比较,剔除与估算参数相差较大的试验数据,将余下的数据取平均作为所需要的变形参数。

Deformation Parameters of Shenzhen Soft Clay

Based on 4 000 sets of experimental data from 15 soft ground improvement sites in Shenzhen region, the physical and deformation characteristics of Shenzhen soft clay are statistically analyzed. It is found that the variation coefficients of compression coefficient, compression module and compression index are large and that the direct use of the arithmetic average values of these (deformation) parameters may result in large error in the calculation of settlement. Water content is a proper parameter to estimate these deformation parameters due to its low variation coefficient and its good interrelation with the compression coefficient if no test data of (deformation) parameters are available. When such data are available, the deformation parameters derived from the test shall be compared with those estimated values based on the water content of the soil sample. Test data with a wide deviation from the estimated value shall be rejected, and the remaining test data shall be averaged and taken as the required deformation parameters.