粉土土水特征曲线影响因素试验及模型验证

Analysis on influential factors of soil-water characteristic curve of silt and model verification

土水特征曲线(SWCC)的影响因素有很多,为了探究其主要影响因素,采用压力板仪测定了初始干密度为1.78 g/cm^3的土样A和初始干密度为1.65 g/cm^3、经固结试验后干密度为1.78 g/cm^3的土样B它们的初始脱湿线,发现二者基本重合。这说明在其他条件相同的情况下,是干密度而非固结压力决定了SWCC形态。测定了土样B的主吸湿线和主脱湿线,并采用毛细滞回简化模型计算了土样的主脱湿线,计算所得主脱湿线和试验得到的主脱湿线基本重合,验证了该模型的有效性。

There are many factors affecting the soil-water characteristic curve（ SWCC）. Soil sample A with initial dry density of 1. 78 g/cm3 and soil sample B with initial dry density of 1. 65 g/cm3 and dry density of 1. 78 g/cm3 after consolidation were tested by pressure plate apparatus and their initial drying curves were determined. It was found that the two curves are basically coincident,showing that dry density rather than the consolidation pressure is the determining factor in SWCC morphology. The main drying and wetting curves of soil sample B were measured and the main drying curve was simulated by using the simplified capillary hysteresis model. The calculated main drying curve was basically the same with the measured one,showing that the presented model is correct.