某黏性土压缩性与微细结构形态之间关系的研究

Research on Correlation between Compressibility and Micro-structural Form of Cohesive Soil

从土体内部结构形态角度分析了黏性土压缩性影响因素。通过微细结构光学测试系统拍摄了七组压缩性不同的黏性土的微细结构图片,并提取了相应的微细结构量化参数;运用多元线性回归法对黏性土的压缩系数和各微细结构量化参数进行关联性分析,从而确定了各微细结构要素对黏性土压缩性影响的大小。研究表明:粘性土的压缩性与颗粒的形态、分布及排列、孔隙的分布情况密切相关。一般来说,颗粒的分布分维、定向度、圆度越小,土体的压缩性就越低,抗压性能就越好。

The influential factors of cohesive soil＇s compressibility has been analyzed based on its interior structure. Sets of micro-structural photos of seven samples with different compressibility were taken by using image processing system. Quantitative micro-structural parameters were therefore derived. The correlation between compressibility coefficients and each micro-structural parameters were analyzed by using multi-linear regression method to determine the effect how each micro-structural element applies on the cohesive clay＇s compressibility. The results show that the compressibility of cohesive soil is closely related to its grain morphology, granulometric distribution, grain packing and pore distribution. Generally, the smaller the distributing fractal dimension, directional entropy and circularity of particles are, the lower compressibility and the higher compressive strength the soil mass has.