岩石裂隙渗流立方定律的修正及应用  

Revision and application of seepage cubic law in rock fracture

作　　者：徐青 喻亚奇 XU Qing;YU Yaqi(State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源工程与调度全国重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2024年第8期1013-1021,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金重点项目(编号:51939008)。

摘　　要：单裂隙渗流研究是裂隙岩体渗流研究的基础,其渗透特性的重要影响因素除裂隙的水力隙宽外,还有起伏粗糙度等裂隙面的形貌特征。首先总结了单裂隙立方定律修正系数的研究成果,然后建立锯齿形裂隙和节理粗糙度系数(joint roughness coefficient,JRC)裂隙数值模型,并通过数值模拟,分别提出了基于综合考虑裂隙相对凸起高度、起伏角和曲折度等多几何因素和基于JRC指标的修正系数公式,前者具有全面反映裂隙粗糙形态、修正系数更为精确的优势,而后者则具有简单便捷、实际操作性强的特点。最后,以基于JRC指标的修正系数公式为例,展示了某工程裂隙岩体的三维渗透张量求解结果。The study of single fracture seepage in rock fracture is the basis for the permeability study of fractured rock masses.In addition to the hydraulic aperture of fracture,the morphology characteristics of fracture surface,such as the undulation roughness,are important factors affecting the permeability characteristics.In this paper,the research results of correction coefficient of single fissure cubic law are summarized firstly.Then,the numerical models of zigzag cracks and JRC(joint roughness coefficient)indices are established.Through numerical simulation,the correction coefficients formulas based on the comprehensive consideration of multiple geometric factors(e.g.relative convex height,dip angle and curvature of the fracture)and the JRC indices are proposed respectively.The former possesses the advantage of fully reflecting the rough shape of cracks and the correction coefficient is more accurate,whereas the latter is simple,convenient and fairly practical.Finally,taking the modified coefficient formula based on JRC index as an example,the results of three-dimensional permeability tensor of the fractured rock mass in a hydraulic project are presented.

关 键 词：裂隙岩体 渗流 立方定律 修正系数 粗糙度 JRC 渗透张量 

分 类 号：TV6[水利工程—水利水电工程]