This paper discusses the way in which the presence of fine content (silt and/or clay size particles) influences the shape of the SWRC for unsaturated soils. The van Genuchten (1980), VG, equation, is used for predicting the SWRC for different sedimentary soils separated based on two classification approaches: one based on measured size ranges defined by fines content and another based on soil texture classes. The mean values of the saturated hydraulic conductivity for the evaluated data correspond to typical permeability values of silty sands. The influence of the amount of fines is clearly shown in the SWRC for the investigated soils, but no dependence was observed between the fines contents and the VG coefficients for the evaluated soils with fines contents above 30%. When the percentage of fines is such that it fills all voids of the coarser particles, the classification exclusively by texture should not be used to estimate VG coefficients.
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机译：本文讨论了细含量（淤泥和/或粘土尺寸颗粒）的存在的方式影响不饱和土壤的SWRC的形状。 Van Genuchten（1980），VG等式用于预测基于两种分类方法分离的不同沉积土的SWRC：一个基于由罚款含量和基于土壤纹理类别的另一种定义的测量尺寸范围。评估数据的饱和液压导电性的平均值对应于粉状砂的典型渗透率值。在SWRC中清楚地示出了细粒量的影响，用于研究的土壤，但在细粒含量和评估土壤的VG系数之间没有观察到含量超过30％的含量的VG系数之间的依赖性。当罚款百分比使得它填充粗糙颗粒的所有空隙时，仅由纹理的分类不应用于估计VG系数。
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