基于 CPT 的合肥老黏土土性波动范围计算分析

文章选取合肥市2处相距较远的典型场地进行静力触探试验(cone penetration test, CPT)，对合肥老黏土层CPT数据进行去趋势化处理，并对其进行平稳性和各态历经性检验，确定随机场模型的适用性。分析探究取样间距和取样范围对合肥老黏土土性波动范围的影响，并采用空间递推平均法对合肥老黏土层竖向土性波动范围进行计算统计。结果表明：随着取样间距的增大，土性波动范围计算结果随之增大，标准差也呈增大趋势；随着取样范围增大，土性波动范围计算结果呈先增大后逐渐平稳的趋势；根据两场地的计算结果得出合肥地区老黏土波动范围的均值变化范围为0.57~0.68 m。该研究成果可为合肥地区岩土工程设计和稳定性评价提供参考。

In this paper, the cone penetration test (CPT) was carried out at two typical sites far away from each other in Hefei. The trend removal methods were used for the CPT data of Hefei old clay layer, and then the stationarity and ergodicity tests were carried out on the processed data to verify the applicability of the random field model in the region. On this basis, the effect of sampling spacing and sampling range on the scale of fluctuation of soil properties of Hefei old clay was discussed, and the spatial recurrence average method was used to calculate the vertical scale of fluctuation of soil properties of Hefei old clay layer. The results show that with the increase of sampling spacing, the calculation results of the scale of fluctuation of soil properties increase, and the standard deviation of the calculation results also tends to increase; with the increase of sampling range, the calculation results of the scale of fluctuation of soil properties increase first and then gradually smooth; based on the calculation results of the two sites, the mean range of scale of fluctuation of soil properties of old clay in Hefei area is 0.57-0.68 m. The research results can provide a reference for geotechnical engineering design and stability evaluation in Hefei area.