粗糙交叉裂隙渗流行为模拟研究  

Simulation research of rough cross fracture seepage behavior

作　　者：赵桐 郑立航 李鑫丞 谢晶[1] Zhao Tong;Zheng Lihang;Li Xincheng;Xie Jing(Sichuan University,College of Water Resources and Hydropower,Chengdu Sichuan 610065,China)

机构地区：[1]四川大学,水利水电学院,四川成都610065

出　　处：《山西建筑》2023年第13期110-113,176,共5页Shanxi Architecture

基　　金：四川大学大学生创新创业训练计划:不同粗糙程度的复杂裂隙体渗流行为的规律研究(项目编号:C2022119330);中国博士后科学基金特别资助项目(2021T140485)。

摘　　要：以分形维数与交叉角度一定的复杂交叉裂隙体模型为核心研究对象,采用MATLAB与CAD平台建立了分形维数D=1.1、交叉角度θ=90°的交叉裂隙体模型,基于COMSOL软件模拟了不同水头比工况下交叉裂隙的渗流行为规律并对其进行定量表征,探讨了不同水头比对交叉裂隙流量、雷诺数、欧拉数、流线等定量指标的影响规律。结果表明:随着水头比增大,两侧分支裂隙渗流能力同步增加,总渗流量增大。水头增大侧分支裂隙的出流量始终比另一侧分支裂隙出流量略大,且随水头比增大二者出流量差值增大;随着水头比的增大,两分支裂隙的雷诺数一同增大,水头增大侧的雷诺数略大于另一侧,更快进入湍流阶段;水头增大侧分支裂隙欧拉数始终较高,而另一侧的欧拉数随着水头比增大而减小,说明水头比的增大会强化水头较大一侧对另一侧的动量补充;随着水头比的增大,水头较大一侧对另一侧的分流量增大,不会发生明显的混流。Based on the model of complex cross-fissure body with certain fractal dimension and cross angle as the core research object,the fractal dimension D=1.1 and cross angle are established with MATLAB and CAD platform.The 90 degree cross-fissure body model simulates and quantitatively characterizes the seepage behavior of cross-fissure under different head ratio conditions based on COMSOL software,and discusses the influence laws of different head ratios on the quantitative indexes such as cross-fissure flow rate,Reynolds number,Euler number and streamline.The results show that with the increase of water head ratio,the seepage capacity of both branch fissures increases simultaneously and the total seepage flow increases.The discharge of branch fissure on the side with increased head is always slightly higher than that of branch fissure on the other side,and the difference of discharge between the two is bigger with the increase of head ratio.With the increase of head ratio,the Reynolds number of the two branch fissures increases together,and the Reynolds number on the side of head increase is slightly larger than that on the other side,thus entering the turbulent phase more quickly.The Euler number of branch fissures on the side with increased head is always higher,while the Euler number on the other side decreases with the increase of head ratio,which indicates that the increase of head ratio will enhance the momentum supplement from the side with larger head to the other side.With the increase of head ratio,the flow distribution from one side with larger head to the other side increases and no obvious mixing occurs.

关 键 词：交叉裂隙 裂隙渗流 动量损失 入水口压力 不同水头比 

分 类 号：TU441.33[建筑科学—岩土工程]