基于渗流-应力耦合的近水平层状裂隙岩体渗透张量估算

王俊智; 陈艳国; 张海丰; 万伟锋

doi:10.11988/ckyyb.20231110

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raybet体育在线院报 ›› 2025, Vol. 42 ›› Issue (2) : 115-121. DOI: 10.11988/ckyyb.20231110

岩土工程

基于渗流-应力耦合的近水平层状裂隙岩体渗透张量估算

王俊智 ¹^,² ,
陈艳国 ¹^,² ,
张海丰 ¹^,² ,
万伟锋 ¹^,²

作者信息 +

Estimation of Hydraulic Conductivity Tensor of Nearly-horizontal Stratified Fractured Rock Mass Based on Seepage-Stress Coupling Theory

WANG Jun-zhi ¹^,² ,
CHEN Yan-guo ¹^,² ,
ZHANG Hai-feng ¹^,² ,
WAN Wei-feng ¹^,²

Author information +

文章历史 +

摘要

定量评价裂隙岩体的渗透能力及各向异性特征是水利水电工程地质勘察的重要内容,可为防渗帷幕设计、基坑降排水设计、水工隧洞突涌水预测等提供技术支撑。为了探究近水平层状裂隙岩体的渗透能力,介绍了一种基于“渗流-应力”耦合理论的渗透张量估算方法。该方法联合使用常规垂直钻孔压水试验、水平定向钻孔压水试验与岩体应力测试,通过建立“结构面法向应力-结构面张开度”负指数函数关系,估算结构面的等效水力张开度,计算岩体的渗透张量。该方法在黄河古贤水利枢纽工程中进行了实际应用,分析了坝址区岩体渗透参数各向异性的发育特征。结果表明,相较于常规垂直孔压水试验,所提方法更能表征岩体的渗透能力和各向异性渗透特征,其换算得到的综合渗透系数约是常规垂直孔压水试验的15倍。研究成果可为渗控工程设计提供科学指导。

Abstract

Quantitative evaluation of the permeability and anisotropy of fractured rock masses is crucial for engineering geological investigations in water conservancy and hydropower projects. Such evaluations provide essential technical support for designing anti-seepage curtains, foundation pit drainage systems, and predicting water inrush in hydraulic tunnels. In this paper, we introduce a method for estimating the hydraulic conductivity tensor of nearly horizontally layered fractured rock masses based on “seepage-stress” coupling theory. This method integrates conventional vertical borehole water pressure tests, horizontal directional borehole water pressure tests, and rock mass stress tests. By establishing a negative exponential function relationship between normal stress and aperture, the equivalent hydraulic aperture of the structural plane is estimated, and the hydraulic conductivity tensor of the rock mass is calculated. This method has been applied to the Guxian water resources management project on Yellow River as a case study. The anisotropy of the hydraulic conductivity in the dam site area was analyzed. Results demonstrate that, compared with conventional vertical borehole water pressure tests, the proposed method better characterizes the permeability and anisotropic properties of the rock masses. Specifically, the comprehensive permeability coefficient obtained using the proposed method is approximately 15 times that of conventional tests, providing valuable scientific guidance for the design of seepage control engineering.

导出引用

王俊智, 陈艳国, 张海丰, 等. 基于渗流-应力耦合的近水平层状裂隙岩体渗透张量估算[J]. raybet体育在线院报. 2025, 42(2): 115-121 https://doi.org/10.11988/ckyyb.20231110

WANG Jun-zhi, CHEN Yan-guo, ZHANG Hai-feng, et al. Estimation of Hydraulic Conductivity Tensor of Nearly-horizontal Stratified Fractured Rock Mass Based on Seepage-Stress Coupling Theory[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(2): 115-121 https://doi.org/10.11988/ckyyb.20231110

中图分类号： TV543 (灌浆和防渗墙工程)

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https://doi.org/10.11988/ckyyb.20170290

摘要

岩体结构面产状数据的统计分组是工程地质、水文地质工作中基础但十分重要的环节。常用的倾向、走向玫瑰花图和极点等密度图人为主观因素大,需借助合适的数学手段对结构面产状数据进行客观划分。基于K-means聚类方法和I Index聚类有效性检验指标,提出了一种岩体结构面自动分组方法,并开发了岩体结构面自动分组程序RDAP。通过与经典文献进行对比,验证了所提分组方法的可靠性。最后,以某工程为例,使用RDAP对实测涌水裂隙资料进行了预处理,初步计算了灌浆钻孔的最佳方位,为工程涌水的防治提供了依据。

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https://doi.org/10.11988/ckyyb.20170290

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Classifying the orientations of rock discontinuities is a fundamental but critically important routine of engineering geology and hydrogeology. The commonly-used rose diagrams of dip directions and strikes and poles to orientations are subjective. It is appreciated to resort to mathematical approaches. In this paper, an automatic grouping method is proposed based on the algorithms of <i>K</i>-means cluster analysis and cluster validity index <i>I</i>, and a Rock Discontinuities Auto-classification Program (RDAP) is developed. By comparing with Shanley and Mahtab’s result (1976), the reliability of the new grouping method or RDAP is verified. In the end, RDAP is used to cluster the gushing fractures to aid in the selection of the optimum position of grouting drillings of a project, which provides a basis for the prevention and control of water gushing.

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