昆明某工程区冲湖积土物理力学指标统计规律研究

Study on the Statistical Law of Physical and Mechanical Indexes of Alluvial Lacustrine Soils in A Project Area of Kunming

土体的物理力学指标是工程勘察的重要参数,以昆明某工程区近120组冲湖积土试样的指标数据为研究对象,总结了14个指标的分布区间、标准差、平均值、变异系数及指标间的相关关系,拟合38组指标间的关系式,采用图示法和计算法描述土体指标的正态性。结果表明:重力密度与土粒比重指标的变异系数小;Pearson相关系数大于0.53的38组指标中,土粒比重与天然含水率、天然孔隙比、液塑限、塑性指数、有机质含量、压缩系数和天然孔隙比与重力密度、压缩模量及重力密度同液塑限、塑性指数、压缩系数、有机质含量呈负相关关系,其余选取的指标间均呈正相关;在5%的显著水平下,14个指标中仅饱和度、液性指数、粘聚力(快剪)服从正态分布。以期为类似地区的工程勘察提供建议。

Physical and mechanical indices of soil are important parameters for engineering investigation.The data of nearly 120 groups of alluvial soil specimens in an engineering area,Kunming were used to study the distribution intervals,standard deviations,mean values,coefficients of variation and correlations among 14 indices,to fit the relationship equation between 38 groups of indices,and to test the normality of soil indices by graphical and computational methods.The results showed that:coefficients of variation between gravity density and specific gravity of soil grains were small;among the 38 groups of indicators with Pearson correlation coefficient greater than 0.53,the specific gravity of soil grains was negatively correlated with natural water content,natural pore ratio,liquid-plastic limit,plasticity index,organic matter content,compression coefficient and natural pore ratio and gravity density,compression modulus and gravity density with liquid-plastic limit,plasticity index,compression coefficient,organic matter content.The rest of the selected indicators were positively correlated with each other;among the 14 indicators,only saturation,liquidity index and cohesion(fast shear)obeyed normal distribution at 5%level of significance.In order to provide suggestions for the engineering investigation in this area.