Electro-chemo-mechanical couplings in swelling clays derived from a micro/macro-homogenization procedure
Electro-chemo-mechanical couplings in swelling clays derived from a micro/macro-homogenization procedure
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DOI：
10.1016/s0020-7683(02)00461-4
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发表时间：
2002-12
影响因子：
3.6
通讯作者：
C. Moyne;M. Murad
中科院分区：
文献类型：
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作者：
C. Moyne;M. Murad
基于微观结构行为的严格放大，导出了由二元一价电解质水溶液饱和的带电固相组成的高度压实膨胀粘土的宏观模型。应用均质化技术将孔隙尺度模型中可用的信息传播到宏观尺度。宏观电动现象，例如由流动电势梯度驱动的电渗流、移动电荷的电泳运动和渗透引起的膨胀，是通过均质化微观电流体动力学以及控制电解质溶液流动、离子运动和电势分布的能斯特-普朗克和泊松-玻尔兹曼方程而导出的。本文提出的放大过程的一个显着结果是动电系数和膨胀压力的微机械表示。该两尺度模型通过有限元方法进行离散化，并应用于数值模拟污染物通过卫生垃圾填埋场下方压实粘土衬垫的迁移和动电衰减。
A macroscopic model for highly compacted expansive clays composed of a charged solid phase saturated by a binary monovalent aqueous electrolyte solution is derived based on a rigorous scale-up of the microstructural behavior. The homogenization technique is applied to propagate information available in the pore-scale model to the macroscale. Macroscopic electrokinetic phenomena such as electro-osmotic flow driven by streaming potential gradients, electrophoretic motion of mobile charges and osmotically induced swelling are derived by homogenizing the microscopic electro-hydrodynamics coupled with the Nernst–Planck and Poisson–Boltzmann equations governing the flow of the electrolyte solution, ion movement and electric potential distribution. A notable consequence of the upscaling procedure proposed herein are the micromechanical representations for the electrokinetic coefficients and swelling pressure. The two-scale model is discretized by the finite element method and applied to numerically simulate contaminant migration and electrokinetic attenuation through a compacted clay liner underneath a sanitary landfill.