黏粒对红黏土微观结构及力学性质的影响

为探究黏粒对红黏土的抗剪强度指标和微观结构的影响,通过制备不同黏粒掺量的红黏土试样,对其进行固结不排水试验和扫描电镜试验。结果表明,黏粒对红黏土的黏聚力和内摩擦角都有明显的影响,黏聚力随着黏粒的增多而增大,内摩擦角随着黏粒的增多而减小,通过微观结构的分析,掺入黏粒后,土体的颗粒分布不均,大小不一且复杂化,黏粒会填充红黏土的孔隙,黏粒掺量越高,土样看起来越细密,黏粒会将颗粒紧密连结。

In order to explore the influence of clay on the shear strength index and microstructure of red clay, red clay samples with different clay content were prepared and subjected to consolidated undrained test and scanning electron microscope test. The results show that clay particles have a significant impact on the cohesion and internal friction angle of red clay. The cohesion increases with the increase of clay particles, and the internal friction angle decreases with the increase of clay particles.Through the analysis of microstructure, after adding clay particles, the particle distribution of soil is uneven, the size is different and complex, and the clay particles will fill the pores of red clay. The higher the clay content is, the finer the soil sample looks,and the clay particles will connect the particles closely.