成都平原粉土和粉砂土的土-水特征曲线研究

Characteristics Research on SWCC of Silt and Silty Sand in the Chengdu Plain

土体与土中非饱和水之间关系可以用土-水特征曲线(SWCC)来表示。利用压力板仪对成都平原采集的粉土和粉砂土进行SWCC试验,选取3种模型对试验数据进行拟合,分析粉土和粉砂土的水分特征曲线的规律:通过拟合比较,3种模型均可对SWCC曲线进行较好的拟合,其中Fredlund-Xing模型拟合效果最好;两种壤土的残余含水率基本相同,粉粒(细粒)对土体持水能力作用不甚明显。

The soil- water characteristic curve( SWCC) can be used to study the relationship between the soil and unsaturated water.Experimental research on SWCC is carried out with the pressure plate test to analyze the SWCC of silt and silty sand in the Chengdu plain. The results show that each of the models can fit the experimental data well and Fredlund- Xing model fits best. Two kinds of residual moisture content are basically the same of the loam. The effect of silt on the soil water holding is not obvious.