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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摘要采用饱和土的电渗固结理论通常会高估非饱和状态下土体的电渗排水能力。基于流体质量守恒原理、Darcy定律以及电渗流方程，采用指数函数描述土水特征曲线及水力渗透系数与电渗透系数和吸力间的关系，建立非饱和黏土的一维电渗排水控制方程，推导孔隙水压力、体积含水率及排水量的解析方法，并开展试验验证。在此基础上，分析饱和电渗透系数与水力渗透系数比值(ke/ks)、减饱和系数(?)以及残余体积含水率(?r)对非饱和黏土电渗排水特性的影响。结果表明，电渗排水量随着饱和电渗透系数与水力渗透系数的比值以及减饱和系数的增大而增大，且均呈非线性关系；土体持水性对非饱和土体的电渗排水性状影响显著。所提出的解析解可为非饱和黏土的电渗排水设计及效果评价提供参考。

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	王耀明
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	黄鹏华

关键词 ：土力学, 电渗, 排水, 非饱和土, 解析解, 参数分析

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

引用本文:

王耀明，王柳江，刘斯宏，沈超敏，黄鹏华. 非饱和黏土的一维电渗排水解析理论[J]. 岩石力学与工程学报, 2019, 38(S2): 3767-3774.
WANG Yaoming，WANG Liujiang，LIU Sihong，SHEN Chaomin，HUANG Penghua. One-dimensional analytical theory of electro-osmotic drainage for unsaturated clayey soil. , 2019, 38(S2): 3767-3774.

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

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