Permeability and Soil-Water Characteristic Curve of Undisturbed Loess under Wetting-drying Cycles
To assess the impact of wetting-drying cycles on the hydraulic properties of undisturbed loess,we per-formed saturated permeability tests and soil-water characteristic tests on Q3 loess from Gansu Province under four different wetting-drying cycle paths.The aim is to examine the changes in permeability and soil-water characteristic curves(SWCC)with the number of cycles,cycle amplitude,and lower bound water content.Results revealed that the deterioration of saturated permeability coefficients can be modeled using a hyperbolic function with respect to wetting-drying cycles.After six cycles,the deterioration tends to stabilize.As cycle amplitude increases,the deteri-oration of saturated permeability coefficients exhibits a linear increase,while a linear decrease with the rise in lower bound water content.The SWCC of loess can be represented by the V-G model;parameters θs,α,and n remain relatively unaffected,whereas the parameterθrdeclines exponentially with an increase in the number of cycles.De-terioration models for saturated permeability coefficients and SWCC models considering the above three parameters of wetting-drying cycles are established,enabling the prediction of unsaturated permeability coefficients of loess.
undisturbed loesswetting-drying cyclespermeability coefficientsoil-water characteristic curvedeterioration model
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