基于渗流-应力耦合的近水平层状裂隙岩体渗透张量估算  

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

作　　者：王俊智 陈艳国 张海丰 万伟锋 WANG Jun-zhi;CHEN Yan-guo;ZHANG Hai-feng;WAN Wei-feng(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;Key Laboratory of Water Management and Water Security for Yellow River Basin of Ministry of Water Resources(under Construction),Zhengzhou 450003,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,郑州450003 [2]水利部黄河流域水治理与水安全重点实验室(筹),郑州450003

出　　处：《长江科学院院报》2025年第2期115-121,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金青年基金项目(41902245);河南省重点研发与推广专项(232102320314);黄河勘测规划设计研究院有限公司自主研发项目(2021-KY48)。

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。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.

关 键 词：裂隙岩体 渗透张量 定向压水试验 地应力测试 黄河古贤水利枢纽工程 

分 类 号：TV543[水利工程—水利水电工程]