粉土最优土水特征曲线模型

Study on the Optimum Soil-water Characteristic Curve of Silty Soil

基于压力板仪的轴平移技术,对粉土试样开展室内试验。测试多组特定吸力下试样的含水率,选用Van Genuchten模型、Gardner模型、Fredlund-Xing模型3种幂函数形式的土水特征曲线(SWCC)模型对试验数据进行拟合,得到各模型的拟合参数。3种函数模型的拟合方差依次为Van Genuchten模型>Fredlund-Xing模型>Gardner模型,即3种SWCC模型中Van Genuchten模型对试验用粉土的SWCC拟合精度最高,结果最优。

Based on axial translation technology of pressure plate instrument,laboratory tests were carried out on silty soil samples.To test the moisture content of the samples under multiple groups of specific suction forces.SWCC models with three power function forms,namely Van Genuchten model,Gardner model and Fredlund-Xing model,were used to fit the test data.The fitting parameters of each model are obtained.The results show that the fitting variance of the three functional models is in order of Van Genuchten model>Fredlund-Xing model>Gardner model.Therefore,among the three SWCC models,Van Genuchten model has high fitting accuracy and optimal results for the SWCC of the experimental silt.