Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR029080 |
No‐Flow Fraction (NFF) permeability model for rough fractures under normal stress | |
Hoda Javanmard; Anozie Ebigbo; Stuart D.C. Walsh; Martin O. Saar; Daniel Vogler | |
2021-01-20 | |
发表期刊 | Water Resources Research
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出版年 | 2021 |
英文摘要 | Flow through rock fractures is frequently represented using models that correct the cubic law to account for the effects of roughness and contact area. However, the scope of such models is often restricted to relatively smooth aperture fields under small confining stresses. This work studies the link between fracture permeability and fracture geometry under normal loads. Numerical experiments are performed to deform synthesized aperture fields of various correlation lengths and roughness values under normal stress. The results demonstrate that aperture roughness can more than triple for applied stresses up to 50 MPa – exceeding the valid range for roughness in most previously published models. Investigating the relationship between permeability and contact area indicates that the increase in flow obstructions due to the development of new contact points strongly depends on the correlation length of the unloaded aperture field. This study eliminates these dependencies by employing a parameter known as the No‐Flow Fraction (NFF) to capture the effect of flow stagnation zones. With this concept, a new Cubic‐law‐based permeability model is proposed that significantly improves the accuracy of permeability estimations, compared to previous models. For cases, where the NFF is difficult to obtain, we introduce an empirical relationship to estimate the parameter from the aperture roughness. The new models yield permeability estimates accurate to within a factor of two of the simulated permeability in over three quarters of the 3000 deformed fractures studied. This compares with typical deviations of at least one order of magnitude for previously published permeability models. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/313817 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Hoda Javanmard,Anozie Ebigbo,Stuart D.C. Walsh,等. No‐Flow Fraction (NFF) permeability model for rough fractures under normal stress[J]. Water Resources Research,2021. |
APA | Hoda Javanmard,Anozie Ebigbo,Stuart D.C. Walsh,Martin O. Saar,&Daniel Vogler.(2021).No‐Flow Fraction (NFF) permeability model for rough fractures under normal stress.Water Resources Research. |
MLA | Hoda Javanmard,et al."No‐Flow Fraction (NFF) permeability model for rough fractures under normal stress".Water Resources Research (2021). |
条目包含的文件 | 条目无相关文件。 |
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