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首页> 外文期刊>International Journal of Solids and Structures >Electro-chemo-mechanical couplings in saturated porous media: elastic-plastic behaviour of heteroionic expansive clays
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Electro-chemo-mechanical couplings in saturated porous media: elastic-plastic behaviour of heteroionic expansive clays

机译：饱和多孔介质中的机电耦合：杂离子膨胀黏土的弹塑性行为

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Chemically active saturated clays containing several cations are considered in a two-phase framework. The solid phase contains the negatively charged clay particles, absorbed water and ions. The fluid phase, or pore water, contains free water and ions. Electroneutrality is ensured in both phases, which gives rise to electrical fields. Water and ions can transfer between the two phases. In addition, a part of free water diffuses through the porous medium. A global understanding of all phenomena, deformation, transfer, diffusion and electroneutrality, is provided. Emphasis is laid on the electro-chemo-mechanical constitutive equations in an elastic-plastic setting. Elastic chemo-mechanical coupling is introduced through a potential, in such a way that the tangent elastic stiffness is symmetric. Material parameters needed to estimate the coupling are calibrated from specific experiments available in the recent literature. The elastic plastic behaviour aims at reproducing qualitatively and quantitatively typical experimental phenomena observed on natural clays during chemical and mixed chemo-mechanical loadings, including chemical consolidation and swelling already described in Int. J. Solids Structures (39 (10), 2773-2806) in the simpler context of Na-Montmorillonite clays. Crucially, the successive exposure of a clay to pore solutions with chemical content dominated by a cation already present in the clay or quasi-absent leads to dramatically different volume changes, in agreement with experimental data. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 25]
机译：在两相框架中考虑了含有几种阳离子的化学活性饱和粘土。固相包含带负电的粘土颗粒，吸收的水和离子。液相或孔隙水包含自由水和离子。在两个阶段均确保电中性，这会产生电场。水和离子可以在两相之间转移。另外，一部分自由水通过多孔介质扩散。提供了对所有现象，变形，传递，扩散和电中性的全局理解。重点放在弹塑性环境中的电化机械本构方程上。通过电势引入弹性化学机械耦合，以使切线弹性刚度对称。估计耦合所需的材料参数是根据最近文献中提供的特定实验进行校准的。弹性塑性行为旨在定性和定量再现在化学和混合化学机械载荷过程中在天然粘土上观察到的典型实验现象，包括Int中已经描述的化学固结和溶胀。 J.固体结构（39（10），2773-2806）在较简单的Na-蒙脱土粘土中。至关重要的是，与实验数据相一致，将粘土连续暴露于化学含量受粘土中已经存在或几乎不存在的阳离子支配的孔隙溶液中，会导致体积变化显着不同。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：25]

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