中文摘要：

为了研究纤维改性膨胀土的土水特征，以合肥某工地膨胀土为研究对象进行土水特征曲线（SWCC）试验，研究3种干密度和4种纤维含量对纤维改性膨胀土土水特征的影响。对试验结果按 van Genutchen 模型进行拟合。结果表明：干密度对纤维改性膨胀土 SWCC 的影响有明显规律，随着干密度的增大，同一基质吸力对应的饱和度相应增加；纤维含量对纤维改性膨胀土 SWCC 的影响无明显规律。通过曲线拟合，得到了纤维改性膨胀土 SWCC 的拟合参数值及其统计量，指出参数 n、ws的变异性较小，m 的变异性中等，a、wr的变异性最大。

英文摘要：

In order to study the soil-water characteristics of fiber modified expansive soil, soil water characteristic curve（SWCC） was tested.An expansive soil sampling from an engineering site in Hefei was taken as a research object, and three dry densities and four fiber contents were considered in the experiment.Then, the experimental results were fitted by using the van Genutchen model.The result showed that the effect of dry density on the SWCC of fiber modified expansive soil were obvious.With the increase of dry density, the degree of saturation increase for the same matrix suction.However, the effect of fiber’ s content on the SWCC for fiber modified expansive soil was irregular.The curve fitting parameters and their statistics of SWCC for fiber modified expansive soil were obtained by curve fitting.And it was pointed out that the variability of parameter n and ws were smaller.The variability of parameter m was moderate, while the variability of parameter a and wr was more larger.