Abstract
Dispersed soil is one of the special soils in geotechnical engineering. Its erosion resistance is very low. In the environment of low salinity water or pure water, the cohesive force between the fine particles of clay is mostly or even all disappeared, and the particles are dispersed into cohesive soil particles.
It is very harmful to the project. In recent years, although the dispersion mechanism and test methods have made great progress, it is not enough to guide the engineering application of dispersive soil. Based on the grey relational analysis method of grey system theory, the pinhole test and the fragment test method are expounded, and the physical, chemical and mineral composition factors affecting the dispersion of clay are analyzed theoretically. In the chemical, physical and mineralogical composition of the soil, the chemical properties are greater than the mineralogical and physical properties. Among them, the degree of correlation between pH and sodium ion concentration is relatively high in chemical properties.
Through the gray correlation analysis method, the dispersion mechanism of dispersive soil is further revealed, that is, the soil contains more sodium ions, and the pH is high.
