Microscopic Pore Structure Characteristics and Hydraulic Tortuosity of Unsaturated Remodeled Weakly Expansive Soil
To investigate the variation in pore distribution of remodeled weakly expansive soil at different dry densi-ties,specimens with dry densities of 1.40,1.50,1.60,1.70,1.80 g/cm3 were prepared using a press sample ma-chine.The pore structure and distribution characteristics of these specimens were analyzed through mercury-injec-tion and saturation-permeability tests.The hydraulic tortuosity of the specimens were calculated based on mercury piezometric and saturation permeability tests.The results indicate a consistent pattern in the process of mercury en-tering and exiting specimens of varying dry densities.Due to distinct entry and exit paths and the presence of bottle-neck pores,the mercury retains within the specimens.Furthermore,an increase in dry density results in a reduction in both pore volume and the quantity of large pores.The soil's pore structure becomes more intricate with higher dry densities,exhibiting a negative correlation between average pore diameter,porosity,total pore volume,and fractal dimension.Based on the experimental outcomes,saturated permeability coefficients and hydraulic tortuosity at varied dry densities were computed,revealing that the increase in hydraulic tortuosity with higher dry density lies in the changes in pore size and structure,consequently affecting the fluid's permeation ability within the soil.
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