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RI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。

To identify boundaries of homogeneous soil layers is critical to geotechnical design. The piezocone penetration test (CPTU) data are often used for soil classification, boundaries identification, property evaluation, etc. Statistical methods for soil boundary identification are developed to detect the boundaries of the homogeneous soil layers based on CPTU data. To generate intra-class correlation coefficient index, i.e. RI statistics and Bartlett statistics, it is necessary to perform statistical analysis on CPTU data with intra-class correlation method and modified Bartlett statistic test respectively. The boundaries of homogeneous soil are identified by mechanical layered method using critical RI statistic and critical modified Bartlett test statistic for homogeneity test of soil layers. The CPTU data in three construction sites are assessed to identify boundaries of homogeneous soil layers with the proposed methods. The results compared with the results of the soil classification layered method show that the mechanical layered method can discriminate all primary boundaries decided by the soil classification layered method, and reveal potential secondary soil boundaries.