不同固结压力作用下黄土微观结构试验研究

为研究在不同固结压力作用下,黄土微观结构的变化规律,试验通过制备黄土试样,用电镜扫描(SEM)获取各个固结程度下黄土微观结构图像并利用IPP图像处理软件对微观图像参数计算和参数分类。结果表明:随着固结压力逐渐增大,黄土试样微观结构内部骨架单元体聚合物的连接方式,由架空孔隙向镶嵌孔隙转变,结构逐渐密实,稳定性逐渐增强;在各个固结压力作用下,孔隙数量随着孔径增大而减少,孔隙面积随孔径的增大而增大,大孔隙的变化一定程度上影响了土的工程性质;固结后土体的孔隙面积在各个角度区位分布越均匀时,土体受到的扰动越大;土体受固结扰动后,微孔隙的形状没有发生较大变化,部分小、中孔隙产生变形,大孔隙逐渐被消散,向着椭圆率更小的方向发展。

Microstructure test of loess under different consolidation pressures

In order to study the changes of the microstructure of loess under different consolidation pressures,through test preparation of loess samples,the scanning electron microscope (SEM) images were obtained under different degree of consolidation and using IPP image processing software to calculate the parameters and parameter classification of microscopic image.The results show that,with the increase of the pressure of the consolidation,the connection method of the polymer in the micro structure of the loess sample,from overhead porosity to mosaic void ,the structure is compact and the stability is gradually enhanced;Under the influence of each consolidation pressure, the number of pores decreases with the increase of pore size, and the pore size increases with the increase of pore size,to a certain extent,the engineering properties of the soil are affected by the changes of the large pores;The pore size of the soil is more uniform in every angle location,the soil is more disturbed;The shape of the micro hole is not changed, the shape of the micro hole is changed, the shape of the micro hole is changed, the large pores are gradually dissipated, and the direction of the development of the small hole is smaller.