Coupled model for electro-osmosis consolidation and ion transport considering chemical osmosis in saturated clay soils

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Shangqi Ge, Wenhao Jiang, Ji-Peng Wang, Guohui Feng, Lingwei Zheng, Xinyu Xie
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引用次数: 0

Abstract

The electro-osmosis approach efficiently facilitates the rapid dewatering of soil with high water content and contributes to reducing contaminant levels within the clay soil. However, the changes of chemical field caused by ion transport in the clay soil during electro-osmosis process will also influence the clay soil consolidation effect. Existing theories predominantly tend to disregard this crucial physical process and its resultant effects, thereby restraining a comprehensive analysis of electro-osmosis consolidation (EOC) behavior under intricate chemical conditions. This study introduces a concise model of EOC and ion transport considering chemical osmosis. The model considers the nonlinear variation of clay soil parameters such as compressibility, permeability, and effective diffusion coefficients, along with the interaction between EOC and ion transport. Meanwhile, the correctness of the model is verified from different aspects such as theoretical derivation and model comparison. Based on the proposed model, the impacts of the variation in electrical field intensity and chemical concentration on the coupled behaviors between EOC and ion transport are systematically investigated, with and without incorporating nonlinear consolidation characteristics. The results show that diffusion and electro-migration exhibit a more pronounced effect on ion transport during EOC. Simultaneously, with the increase of ion concentration in clay soil pore solution, the effects of chemical osmosis become increasingly apparent, thereby enhancing clay soil settlement.

饱和粘土中考虑化学渗透的电渗固结和离子传输耦合模型
电渗法能有效促进高含水量土壤的快速脱水,并有助于降低粘土中的污染物含量。然而,电渗过程中粘土中离子传输引起的化学场变化也会影响粘土的固结效果。现有理论主要倾向于忽略这一关键物理过程及其产生的影响,从而限制了对复杂化学条件下电渗固结(EOC)行为的全面分析。本研究引入了一个考虑到化学渗透的 EOC 和离子传输简明模型。该模型考虑了粘性土参数(如压缩性、渗透性和有效扩散系数)的非线性变化,以及 EOC 和离子传输之间的相互作用。同时,从理论推导和模型对比等不同方面验证了模型的正确性。在所建模型的基础上,系统地研究了电场强度和化学浓度的变化对 EOC 与离子传输之间耦合行为的影响。结果表明,在 EOC 过程中,扩散和电迁移对离子传输的影响更为明显。同时,随着粘土孔隙溶液中离子浓度的增加,化学渗透的作用也越来越明显,从而促进了粘土的沉降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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