考虑干密度和压实含水率影响的弱膨胀土土水特征曲线研究

通过采用常规压力板仪对压实含水率、制样干密度、土样结构等3种因素对非饱和弱膨胀土土水特征曲线的影响进行研究,通过采用Van Genuchten模型、Fredlund-Xing模型,通过最小二乘法对所测土水特征曲线进行拟合,着重分析了土样孔隙结构对土水特征曲线的影响。结果表明,常用的土水特征曲线模型Van Genuchten模型和Fredlund-Xing模型均可较好地对压实膨胀土样和原状样土水特征曲线进行拟合,但对于石灰改性膨胀土Fredlund-Xing模型的拟合效果较好。

EFFECT OF DRY DENSITY AND INITIAL MOISTURE CONTENT ON SOIL WATER CHARACTERISTIC CURVE OF WEAK EXPANSIVE SOIL

This paper detailedly study the effects of dry density , water content and structure on Soil Water Characteristic Curve of unsaturated weak expansive soil by conventional Pressure Plate, fit the Soil Water characteristic curve by Least Squares Method with Van Genuchten model and Fredlund-Xing model, and emphatically analyses the Influence of structure on soil-water characteristic curve. The results showed that the fitting effect of Soil Water characteristic curve is good, when two kinds of models are used to the fitting of compacted expansive soil and undisturbed soil, the Fredlund-Xing model is better for the fitting of improved expansive soil with lime.