北京区域土的压缩性与物理指标相关性分析

Correlation Analysis of the Compressibility and Physical Indices of Soils in Beijing

以北京区域土为研究对象,进行土工参数的变异性分析,研究其物理力学指标的相关性。结果表明:物理性质指标的变异性较小,而力学指标的变异性则相对较大;粉土压缩性的主要影响因素为自重压力、天然密度、饱和度、孔隙比等,而影响黏性土的主要因素为自重压力、含水率、天然密度、液性指数等;应用多元线性回归模型得到压缩模量与含水率、天然密度、孔隙比、自重应力等的关系式。

The compression modulus of soil is the important indicator that can be used to evaluate the compressibility of soil and calculate foundation deformation, validating its importance in engi- neering research. In this study, soils from Beijing, were analyzed to determine the variability of geotechnical parameters and the relation between the physical and mechanical indices. The analy- sis results showed that there was little variability in the physical property indices, but the varia- bility of the mechanical indices was relatively large. For example, the compressibility of silt was affected by the gravity stress, the natural density, the saturation, the porosity ratio, and other factors. The mechanical properties of cohesive soils were affected by the gravity stress, the mois- ture content, the natural weight density, and the liquidity. A multivariate linear regression model of the compression modulus, the moisture content, the natural density, and the gravity stress was developed. This model indicated that there was regional representation in the soils tested.