部分饱和粘土导电的几何有效介质模型

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-08-15 DOI:10.1016/j.jappgeo.2024.105495
Ya Chu , Wei Duan , Guojun Cai , Songyu Liu , Bate Bate , Hanliang Bian
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引用次数: 0

摘要

通过对现有研究的讨论,评估了用于直接电导率(DC)预测的现有经验和理论模型的优势和局限性。先前的研究表明,由于富粘土材料中存在两种类型的水(结合水和散装水),有效介质模型可能无法准确反映实际情况。此外,现有模型无法满足对吸附金属离子的粘土或不饱和粘土的导电性的预测。为解决这一问题,基于多重散射技术提出了一种新的有效介质双水(EMDW)模型,该模型包括土壤颗粒、表面结合水层和体水,并通过控制土壤类型和饱和度来建立。新型 EMDW 模型包括相干势近似模型(CPA),与其他近似模型相比,该模型与实验数据的一致性更佳。此外,还采用了二项式展开近似法来简化公式并方便使用。开发的电导率模型与其他研究人员的数据进行了验证。与其他成熟的电导率模型相比,所提出的 EMDW 模型具有明确的物理意义,可以利用修正的涂层颗粒电导率和饱和电导率准确计算基体电导率。研究结果表明,粘土材料的基质电导率与电物理参数(如孔隙率、饱和度、各不连续相的形状以及表面结合水和体积水的电导率)密切相关。因此,新的 EMDW 模型是一个有理论基础、有物理意义且易于使用的粘土材料电导率预测模型。
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Geometrical effective medium model of electric conduction of partially saturated clays

The current existing researches were discussed to assess the advantages and limitations of existing empirical and theoretical models for direct conductivity (DC) prediction. Prior research has demonstrated that an effective medium model may not accurately reflect the actual situation due to the presence of two types of water (bound water and bulk water) in clay-rich materials. Furthermore, the existing models can not satisfy the prediction of electrical conductivity of metal ions adsorbed clay or unsaturated clay. To address this issue, a new Effective Medium Double Water (EMDW) model was proposed based on multiple scattering techniques, which encompasses soil particles, surface-bound water layers, and bulk water and was established by controlled soil types and degrees of saturation. The novel EMDW model includes the Coherent Potential Approximation (CPA), which has consistently demonstrated superior agreement with experimental data when compared to other approximation models. Moreover, the binomial expansion approximation was utilized to simplify the formula and facilitate its use. The developed conductivity model was validated with data from other researchers. In comparison to other well-established conductivity models, the proposed EMDW model has clear physical meaning and can accurately compute matrix conductivity utilizing modified coated particle conductivity and saturation conductivity. The findings suggest that matrix conductivity in clay materials is significantly correlated with electrical-physical parameters, such as porosity, degree of saturation, shape of each discontinuous phase, and conductivity of surface-bound water and bulk water. Consequently, the new EMDW model is a theoretically grounded, physically meaningful, and easy-to-use model for conductivity prediction in clay materials.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
期刊最新文献
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