ISSN 1000-3665 CN 11-2202/P
    窦智,刘万明,陈舟,等. 穿越层状多孔介质的非达西渗流特征研究[J]. 水文地质工程地质,2024,51(4): 101-107. DOI: 10.16030/j.cnki.issn.1000-3665.202310002
    引用本文: 窦智,刘万明,陈舟,等. 穿越层状多孔介质的非达西渗流特征研究[J]. 水文地质工程地质,2024,51(4): 101-107. DOI: 10.16030/j.cnki.issn.1000-3665.202310002
    DOU Zhi, LIU Wanming, CHEN Zhou, et al. Experimental study on non-darcy flow through layered porous media[J]. Hydrogeology & Engineering Geology, 2024, 51(4): 101-107. DOI: 10.16030/j.cnki.issn.1000-3665.202310002
    Citation: DOU Zhi, LIU Wanming, CHEN Zhou, et al. Experimental study on non-darcy flow through layered porous media[J]. Hydrogeology & Engineering Geology, 2024, 51(4): 101-107. DOI: 10.16030/j.cnki.issn.1000-3665.202310002

    穿越层状多孔介质的非达西渗流特征研究

    Experimental study on non-darcy flow through layered porous media

    • 摘要: 穿越层状多孔介质的非达西渗流多见于人类活动影响下的土壤-地下水系统中。采用自行开发设计的室内渗流实验装置,设置不同粒径的单层多孔介质和相应粒径组合的双层多孔介质,从水力坡降与渗流流速关系、非达西渗流参数和临界雷诺数等方面,探讨了平均粒径、粗细颗粒界面对穿越层状多孔介质非达西渗流特征的影响规律。结果表明:当水流穿越层状多孔介质时,粗细颗粒界面对非达西流渗流特征具有重要影响;作为判断达西流态到非达西流态转换的临界雷诺数,其在单层多孔介质中随多孔介质平均粒径的增大而减小,而当水流穿越层状多孔介质时,临界雷诺数不仅随平均粒径的增大而增大,而且随粗/细颗粒粒径差的减小而增大;受粗细颗粒界面的影响,单层多孔介质中临界雷诺数均低于粗颗粒层与单层多孔介质相同相应粒径组合的双层多孔介质;通过引入非线性分量指数发现,粗细颗粒界面对水流惯性力分量的影响具有一定抑制作用,其抑制性影响程度与粗细颗粒差别大小呈负相关。研究结果对研究穿越层状岩土体的非达西渗流问题具有较好的指导意义。

       

      Abstract: Non-darcy seepage through layered porous media is common in soil-groundwater systems under the influence of human activities. The effect of average particle size and coarse-fine particle interface on the characteristics of non-Darcy porous flow through layered porous media was investigated from the relation between hydraulic gradient and flow velocity, non-Darcy seepage parameters, and critical Reynolds number. The results show that when water flows through layered porous media, the coarse-fine particle interface has an important effect on the characteristics of non-Darcy flow. The critical Reynolds number, which is used to judge the transition from Darcy flow to non-Darcy flow, decreases with the increase of the average particle size in monolayer porous media, but increases with the increase of the average particle size and the decrease of the coarse/fine particle size ratio when water flows through layered porous media. The critical Reynolds number of single-layer porous media is lower than that of the double-layer porous media with the same corresponding particle size due to the coarse-fine particle interface. By introducing the nonlinear component index E, it is found that the coarse/fine particle interface has a certain inhibitory effect on the hydrodynamic inertia force component, and the inhibitory effect degree is negatively correlated with the difference in size of the coarse and fine particles. The results in this study have a good guiding significance for studying non-Darcy seepage through layered rock and soil.

       

    /

    返回文章
    返回