Study on Microscopic Permeability Mechanism of Soil-lime Improved Sand
In order to explore the effects of different amounts of lime on the permeability and microstructure of sand,saturation permeability test,scanning electron microscope test and nuclear magnetic resonance test were carried out on the sand with different lime contents.The permeability and microporous structure of the improved sand were analyzed.The correlation between the permeability and microstructure of the improved sand was studied by using software Image-Pro Plus6.0 and the fractal dimension of nuclear magnetic resonance.The results show that the gelled material produced by the chemical reaction between the proper amount of lime and sand causes the small particles to aggregate and form irregu-lar aggregates,the internal large pores are divided into small pores,the pore roughness increases,and the pore fractal di-mension increases,resulting in the narrowing of the seepage channel,the increase of the tortuosity,and the decrease of the macroscopic permeability coefficient.The incorporation of excessive lime leads to an increase in the area and number of large pores in the soil,a decrease in the fractal dimension,a decrease in roughness,and a slight increase in the macro-scopic permeability coefficient.
万方数据
维普
