干湿循环作用下原状黄土渗透性及其对土-水特征曲线的影响

常洲; 晏长根; 安宁; 兰恒星; 石玉玲; 包含; 许江波

doi:10.11988/ckyyb.20220826

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长江科学院院报 ›› 2024, Vol. 41 ›› Issue (1) : 143-150. DOI: 10.11988/ckyyb.20220826

岩土工程

干湿循环作用下原状黄土渗透性及其对土-水特征曲线的影响

常洲¹, 晏长根¹, 安宁², 兰恒星^3,4, 石玉玲³, 包含¹, 许江波¹

作者信息 +

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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文章历史 +

摘要

为评估干湿循环作用对原状黄土水力特性的劣化效应,对甘肃Q₃黄土进行了4组不同干湿循环路径下的饱和渗透试验与土-水特征测试,分析土体饱和渗透系数和土-水特征曲线随干湿循环次数、循环幅度和下限含水率的变化规律。结果表明:原状黄土饱和渗透系数劣化度与干湿循环次数间关系可采用双曲线函数进行描述,6次循环后劣化度变化趋于稳定;土体饱和渗透系数劣化度随循环幅度增大而线性增大,随下限含水率增大而线性减小。V-G模型对干湿循环下黄土的土-水特征曲线拟合效果良好,模型参数θ_s、α、n变化幅度较小,而参数θ_r随循环次数增加呈指数下降趋势。依据试验结果建立了考虑干湿循环3参数的饱和渗透系数劣化模型与土-水特征曲线模型,并对土体非饱和渗透系数进行了预测分析。

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.

导出引用

常洲, 晏长根, 安宁, 兰恒星, 石玉玲, 包含, 许江波. 干湿循环作用下原状黄土渗透性及其对土-水特征曲线的影响[J]. 长江科学院院报. 2024, 41(1): 143-150 https://doi.org/10.11988/ckyyb.20220826

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

中图分类号： TU43

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