Investigation of permeability properties and anisotropy characteristics for fractured rock masses

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-10-06 DOI:10.1007/s10064-025-04514-6

Kejing Chen, Qinghui Jiang

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引用次数: 0

Abstract

This paper introduces a method for determining the permeability matrix of fractured rock masses using a fracture geometry tensor. By utilizing the eigenvalues of the permeability matrix, the calculated anisotropy index (K_AI) provides insight into the permeability characteristics of fractured rock masses. This index ranges from 0 to 1.414, with higher values signifying a more pronounced degree of anisotropy. Through a detailed analysis of fracture distribution, the study systematically examines the degree of anisotropy across various fracture patterns. It reveals the impact of fracture spacing and aperture on permeability anisotropy, while expertly characterizing the spatial variability of the permeability matrix elements. Furthermore, the relationship between confining pressure and fracture aperture is explored, shedding light on the effects of confining stress on seepage behavior. The findings elucidate how confining pressure alters both the aperture ratio and the anisotropy index of fractures. The mechanisms by which variations in direction and spacing affect permeability parameters under different confining pressures are investigated. By integrating these insights with results from comprehensive field measurements of ground stress, a relationship between stress and depth is constructed, revealing how changes in depth influence permeability characteristics. This research not only advances the understanding of fractured rock masses but also paves the way for more effective management and utilization of subsurface resources.

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裂隙岩体渗透性及各向异性特征研究

介绍了一种利用裂隙几何张量确定裂隙岩体渗透率矩阵的方法。利用渗透率矩阵的特征值，计算得到的各向异性指数（KAI）可以深入了解裂隙岩体的渗透率特征。该指数取值范围为0 ~ 1.414，数值越高，各向异性程度越明显。通过对裂缝分布的详细分析，该研究系统地检查了各种裂缝模式的各向异性程度。它揭示了裂缝间距和孔径对渗透率各向异性的影响，同时熟练地表征了渗透率矩阵元素的空间变异性。进一步探讨了围压与裂缝孔径之间的关系，揭示了围压对渗流行为的影响。研究结果阐明了围压对裂缝孔径比和各向异性指数的影响。研究了不同围压条件下，方向和间距变化对渗透率参数的影响机制。通过将这些见解与综合现场地应力测量结果相结合，构建了地应力与深度之间的关系，揭示了深度变化如何影响渗透率特征。该研究不仅促进了对裂隙岩体的认识，而且为更有效地管理和利用地下资源铺平了道路。

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

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.