大连海相软土物理力学参数统计分析

Statistical Analysis of Physical and Mechanical Parameters of Dalian Marine Soft Soil

摘要: 本文基于大连某人工岛岩土工程勘察资料，采用SPSS软件对大连海相软土物理力学参数进行了统计分析，建立了相关参数间的经验公式。采用偏斜度、峰值检验法对软土物理力学参数的正态分布特征进行了假设检验，并采用Bayes方法对压缩指数、黏聚力及内摩擦角进行了优化。研究结果表明，大连海相软土具有含水率高、孔隙比大、压缩性大、抗剪强度低等特点，参数的离散性相对较小。孔隙比与含水率、液限与含水率、塑性指数与孔隙比、压缩指数与含水率呈显著相关，而黏聚力与含水率、内摩擦角与含水率间呈弱相关。假设检验结果得出，含水率、孔隙比、塑限、液性指数、压缩指数、黏聚力及内摩擦角均服从正态分布。经过Bayes优化后，压缩指数、黏聚力及内摩擦角的标准差与变异系数均有所降低，数据的离散性显著减小。

Abstract: In this paper, based on the geotechnical investigation data of an artificial island in Dalian, SPSS software was used to analyze the physical and mechanical parameters of Dalian Marine soft soil, and the empirical formula between the relevant parameters was established. The skewness and peak value tests were used to test the hypothesis of the normal distribution characteristics of the physical and mechanical parameters of soft soil, and the Bayes method was used to optimize the compression index, cohesion and internal friction angle. The results show that Dalian Marine soft soil has the characteristics of high water content, large pore ratio, high compressibility and low shear strength, and the dispersion of parameters is relatively small. Pore ratio was significantly correlated with water content, liquid limit and water content, plasticity index and pore ratio, compression index and water content, while cohesion was weakly correlated with water content, internal friction angle and water content. The results of hypothesis test show that moisture content, pore ratio, plastic limit, liquid index, compression index, cohesion and internal friction angle all follow normal distribution. After Bayes optimization, the standard deviation and coefficient of variation of compression index, cohesion and angle of internal friction were all decreased, and the dispersion of data was significantly reduced.