Permeability and Soil-Water Characteristic Curve of Undisturbed Loess under Wetting-drying Cycles

CHANG Zhou; YAN Chang-gen; AN Ning; LAN Heng-xing; SHI Yu-ling; BAO Han; XU Jiang-bo

doi:10.11988/ckyyb.20220826

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (1) : 143-150. DOI: 10.11988/ckyyb.20220826

Rock-Soil Engineering

Permeability and Soil-Water Characteristic Curve of Undisturbed Loess under Wetting-drying Cycles

CHANG Zhou¹, YAN Chang-gen¹, AN Ning², LAN Heng-xing^3,4, SHI Yu-ling³, BAO Han¹, XU Jiang-bo¹

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Abstract

To assess the impact of wetting-drying cycles on the hydraulic properties of undisturbed loess, we performed 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 deterioration 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 θ_s, α, and n remain relatively unaffected, whereas the parameter θ_r declines exponentially with an increase in the number of cycles. Deterioration 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.

Key words

undisturbed loess / wetting-drying cycles / permeability coefficient / soil-water characteristic curve / deterioration model

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CHANG Zhou, YAN Chang-gen, AN Ning, LAN Heng-xing, SHI Yu-ling, BAO Han, XU Jiang-bo. Permeability and Soil-Water Characteristic Curve of Undisturbed Loess under Wetting-drying Cycles[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(1): 143-150 https://doi.org/10.11988/ckyyb.20220826

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