This paper presents a detailed study to quantify the influence of grain morphology on sand hydraulic conductivity aided with pore-scale analysis. One hundred and twenty-nine numerical models of Leighton Buzzard sand and Jordan sand were simulated to obtain the flow characteristics, and Matlab code was developed to quantify their pore characteristics. The influence of grain morphology on sand hydraulic conductivity was analyzed using eight grain morphological descriptors, five permeability parameters, and six pore indexes. The results show that the grain morphology affects the specific surface, porosity, and flow tortuosity through the sand, which influences its hydraulic conductivity. The Kozeny-Carman equation well predicts sand hydraulic conductivity but the C_kc in this equation is not a constant and correlates strongly to hydraulic tortuosity. Sand containing grains that are less platy and less concave tend to have an isotropic sand pore/throat structure that associates with a lower C_kc. From the pore-scale perspective, hydraulic conductivity is highly affected by the D₅₀ pore size, which is strongly related to the sand specific surface and porosity. More concave and less spherical grains tend to form more porous sand. Platy and concave grains tend to have a larger variation coefficient and smaller mean in the sand pore and throat sizes, causing a lower sand hydraulic conductivity. These quantitative analyses shed light on the role of grain morphology in affecting the characteristics of the sand pores and throats, and their effect on sand hydraulic conductivity.

本文提供了一项详细的研究，以借助孔隙尺度分析来量化晶粒形态对砂岩水力传导率的影响。模拟了129个Leighton Buzzard砂和Jordan砂的数值模型以获得流动特性，并开发了Matlab代码以量化它们的孔隙特性。使用八个颗粒形态描述符，五个渗透率参数和六个孔隙指数分析了颗粒形态对砂岩水力传导率的影响。结果表明，颗粒形态会影响比表面积，孔隙率和流沙曲折度，从而影响其水力传导率。Kozeny-Carman方程很好地预测了砂的水力传导率，但C _kc该方程中的常数不是常数，与水力曲折度密切相关。含沙较少的板块和较少的凹入的砂粒往往具有各向同性的砂孔/喉孔结构，与较低的C _kc有关。从孔隙尺度的角度来看，D ₅₀对水力传导率的影响很大。孔径，这与砂的比表面积和孔隙率密切相关。凹度较大且球形较小的晶粒往往会形成更多的多孔砂。泥沙和凹粒倾向于具有较大的变异系数，并且在砂孔和喉孔尺寸中具有较小的平均值，从而导致较低的砂子水力传导率。这些定量分析揭示了颗粒形态在影响沙孔和喉咙特征方面的作用，以及它们对沙的水力传导率的影响。