银川平原典型介质的颗粒级配对渗透系数的影响研究

The Influence of the Particle Size on Permeability Coefficient of Typical Medium in Yinchuan Plains

砂性土的颗粒组成较为复杂,由于其渗透系数在实际工程中很难精确测定,因此探讨其经验计算公式就显得尤为重要。通过对银川平原典型介质砂性土的颗粒级配以及渗透性试验,研究颗粒级配条件下砂粒含量对沉积物渗透性的影响,并通过探讨渗透系数与级配参数相关性,对原有经验公式进行修正。结果表明:当土样砂粒含量大于60%时,随着砂粒含量不断增加,渗透系数呈现出线性增加趋势;砂土渗透系数与反映其颗粒级配特征的不均匀系数Cu高度相关,R^(2)为0.81;引入不均匀系数Cu后相关的经验公式能更好反映银川平原砂性土的渗透系数与特征粒径之间的关系。

The particle composition of coarse-grained soil is complex,and it is difficult to accurately measure its permeability coefficient in practical projects,so it is particularly important to explore its empirical calculation formula.In this paper,through the particle gradation and permeability test of typical medium sandy soil in Yinchuan Plains,the influence of sand content on sediment permeability under the condi⁃tion of particle grading is studied,and the correlation between permeability coefficient and gradation parameters is discussed.The empirical formula is revised.The results show that:when the sand content is more than 60%,the permeability coefficient increases linearly with the in⁃crease in sand contents;the permeability coefficient of coarse-grained soil is highly correlated with the non-uniformity coefficient Cu,R^(2)is 0.81;the empirical formula after introducing the non-uniformity coefficient Cu can better reflect the permeability coefficient and characteris⁃tic particle size of coarse-grained soil in Yinchuan Plains.