Solute transport in stochastic discrete fracture-matrix systems: Impact of network structure

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
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Abstract

Obtaining a comprehensive understanding of solute transport in fractured rocks is crucial for various geoengineering applications, including waste disposal and construction of geo-energy infrastructure. It was realized that solute transport in fractured rocks is controlled by stochastic discrete fracture-matrix systems. However, the impacts and specific uncertainty caused by fracture network structures on solute transport in discrete fracture-matrix systems have yet not been fully understood. In this article, we aim to investigate the influence of fracture network structure on solute transport in stochastic discrete fracture-matrix systems. The fluid flow and solute transport are simulated using a three-dimensional discrete fracture matrix model with considering various values of fracture density and size (i.e., radius). The obtained results reveal that as the fracture density or minimum fracture radius increases, the corresponding fluid flow and solute transport channels increase, and the solute concentration distribution range expands in the matrix. This phenomenon, attributed to the enhanced connectivity of the fracture network, leads to a rise in the effluent solute concentration mean value from 0.422 to 0.704, or from 0.496 to 0.689. Furthermore, when solute transport reached a steady state, the coefficient of variation of effluent concentration decreases with the increasing fracture density or minimum fracture radius in different scenarios, indicating an improvement in the homogeneity of solute transport results. The presented analysis results of solute transport in stochastic discrete fracture-matrix systems can be helpful for uncertainty management in the geological disposal of high-level radioactive waste.

随机离散断裂-基质系统中的溶质迁移:网络结构的影响
全面了解裂隙岩中的溶质运移对于各种地质工程应用(包括废物处理和地质能源基础设施建设)至关重要。人们认识到,裂隙岩中的溶质运移受随机离散裂隙-基质系统控制。然而,断裂网络结构对离散断裂-基质系统中溶质迁移的影响和具体的不确定性尚未得到充分了解。本文旨在研究随机离散断裂-基质系统中断裂网结构对溶质迁移的影响。我们使用三维离散断裂基质模型模拟了流体流动和溶质迁移,并考虑了不同的断裂密度和尺寸(即半径)值。结果表明,随着断裂密度或最小断裂半径的增加,相应的流体流动和溶质迁移通道也会增加,基质中的溶质浓度分布范围也会扩大。这一现象归因于断裂网络的连通性增强,导致出水溶质浓度平均值从 0.422 上升到 0.704,或从 0.496 上升到 0.689。此外,当溶质运移达到稳定状态时,在不同情况下,流出浓度的变异系数随着裂缝密度或最小裂缝半径的增加而减小,表明溶质运移结果的均匀性有所改善。本文介绍的随机离散断裂-基质系统中溶质迁移的分析结果有助于高放射性废物地质处置过程中的不确定性管理。
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
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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