Abstract
The seepage calculation of unsaturated soil has always been an important subject in the field of geotechnical engineering, and it greatly influences the stability of geotechnical engineering. Currently, most of the unsaturated soil seepage calculation formulas consider only the saturation. In fact, the seepage of the soil is also affected by other factors, such as pore size. Therefore, considering the influence of void ratio in the seepage calculation of unsaturated soil is worthy of further investigation. In this study, a seepage function of unsaturated soil, which considers the influence of dry density and saturation, was constructed and introduced into ABAQUS program. An engineering case was calculated, and the difference between the results considering two variables and that only considering saturation was compared and analyzed. The analysis of the results indicates that this function can better characterize unsaturated seepage, and its subprogram is applicable.
Highlights
The study on seepage calculation of unsaturation soil is important in geotechnical engineering
The field variable FV1 to S should be updated through the USDFLD subroutine in the calculation process to realize the variation in permeability coefficient with dry density and saturation in the program
The unsaturated seepage model considering bivariate of dry density and saturation can be introduced into the finite element method
Summary
The study on seepage calculation of unsaturation soil is important in geotechnical engineering. (Yu et al, 2008; Han et al, 2018: Zhang et al, 2021) studied the stability of unsaturated soil slope under unsteady seepage condition. A permeability function for unsaturated soil considering bivariate of dry density and saturation was proposed. It was introduced into the ABAQUS finite element program by subprogram development. The model considers the influence of the change in both saturation and dry density on the permeability coefficient in seepage process. This calculation process is considered to be more consistent with the stress state in seepage engineering
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