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对于岩土工程设计来说,准确识别均质土层的边界是极其重要的。孔压静力触探(CPTU)测试数据常用于土分类、土层边界识别和岩土工程参数评价等方面。基于CPTU测试数据,利用统计分析方法进行力学分层,可以有效地识别均质土层边界。采用组内相关系数法和修正的Bartlett检验,对CPTU测试数据进行统计分析,生成相应的组内相关系数指标RI和Bartlett统计量。结合R_I和修正的Bartlett统计量临界值,检验土体的均质性,确定均质土层的边界,从而进行力学分层。利用3个场地的CPTU数据进行力学分层,并将其结果与土性分层结果进行对比。结果表明,力学分层结果不仅能分辨出全部主要的土性分层界面,而且还显示更多潜在的次级力学分层界面。
For geotechnical engineering, it is extremely important to accurately identify the boundary of homogeneous soil. Hole CPTU test data are often used in soil classification, soil boundary identification and geotechnical engineering parameters evaluation. Based on the CPTU test data, the mechanical stratification can be done by statistical analysis method, which can effectively identify the boundaries of homogeneous soil. Using the intra-group correlation coefficient method and the modified Bartlett test, the CPTU test data were statistically analyzed to generate the corresponding intra-group correlation coefficient index RI and Bartlett’s statistics. Combining R_I with Bartlett’s modified critical value, the homogeneity of soil is tested and the boundary of homogeneous soil layer is determined, so that the mechanical stratification is carried out. The mechanical stratification was carried out using CPTU data of three sites and the results were compared with the results of stratification of soil. The results show that the mechanical layering results can not only identify all the major soil layering interfaces, but also reveal more potential secondary layering interfaces.