非饱和黏土的一维电渗排水解析理论

doi:10.13722/j.cnki.jrme.2018.0731

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Abstract The ability of electro-osmotic drainage in unsaturated soils is always overestimated using the consolidation theories for fully saturated soils. In this study，a one-dimensional model for vertical electro-osmotic drainage under unsaturated conditions was proposed，based on the law of fluid mass conservation，Darcy?s law and electro-osmotic flow equation. Exponential functions were incorporated in the model to represent the relationships of hydraulic and electro-osmotic conductivities with matric suction and the soil-water characteristic curve. The analytical solutions for pore water pressure，volumetric water content，and drainage were derived，and a laboratory test was performed to verify their effectiveness. After that，the parametric study was conducted to illustrate impacts of the ratio of saturated electro-osmotic conductivity to saturated hydraulic conductivity(ke/ks)，desaturation coefficient(?) and residual moisture(?r) on the behaviour of electro-osmotic drainage. The result shows that the drainage increases non-linearly with an increase in the values of ke/ks and α. The influence of the water retention capability of soil is significant on the drainage behaviour of electro-osmosis in unsaturated soils. Thus，the proposed analytical solution can provide guidance for the design and effect evaluation of electro-osmotic drainage system in unsaturated soils.

Key words： soil mechanics electro-osmosis drainage unsaturated soils analytical solution parametric study

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	WANG Yaoming
	WANG Liujiang
	LIU Sihong
	SHEN Chaomin
	HUANG Penghua

Cite this article:

WANG Yaoming,WANG Liujiang,LIU Sihong, et al. One-dimensional analytical theory of electro-osmotic drainage for unsaturated clayey soil[J]. , 2019, 38(S2): 3767-3774.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0731 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS2/3767

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