宁波软黏土土性相关距离计算分析

相关距离是应用随机场理论进行岩土工程可靠度分析的重要参数。基于宁波某地铁车站地质勘察资料，分析取样间距对宁波软黏土层相关距离的影响，提出宁波软黏土层相关距离在取样间距变化时的确定原则。同时，分析了依据不同土性参数和不同计算方法得到的宁波软黏土层相关距离的差异，并应用Wilcoxon单向评秩分析方法对各自的差异进行统计检验。检验结果表明，各自的差异均不存在统计显著性。结合宁波轨道交通1号线工程地质勘察资料，对该地区典型软黏土层竖向相关距离进行计算和统计，得到淤泥质黏土层和淤泥层的竖向相关距离代表值分别为0.436 m与0.352 m。

Calculation of correlation distance of Ningbo soft clay

The correlation distance is an important parameter in geotechnical reliability analysis based on random field theory. Based on the geological investigation data of Ningbo subway station, the influence of sampling spacing on the correlation distance of Ningbo soft clay layer is analyzed, and the principle of determining the correlation distance of Ningbo soft clay layer with the varied sampling spacing is presented. In addition, we explore the diversity in correlation distances of Ningbo soft clay layer obtained by different soil parameters and different calculation methods, and Wilcoxon rank sum test method is used to analyze the differences statistically. The results indicate that there is no statistical significance in correlation distances obtained by different methods and parameters. According to the geological investigation data of Ningbo metro line No.1, the vertical correlation distance of the Ningbo soft clay is calculated, and the vertical correlation distances of the mucky clay layer and the silt layer are 0.436 m and 0.352 m respectively.