相对渗透系数与土水特征曲线(SWCC)是研究非饱和流的重要参数,利用毛细管系统研究渗流已经成为研究相对渗透系数的重要方法之一。在用毛细管系统代替土孔隙的假设上,基于杨-拉普拉斯方程和分形理论,对传统的毛细管系统含水量模型作出改进,考虑非饱和孔隙的含水量,提出一个预测非饱和土相对渗透系数的模型。利用4组试验数据对提出的相对渗透系数预测模型进行验证,用均方根偏差(RMSD)评测试验数据与预测数据之间的误差,结果表明4组数据的RMSD均＜0.025,说明该模型具有预测非饱和土相对渗透系数的实际意义。
Abstract
Relative permeability coefficient and soil-water characteristic curve(SWCC) are important parameters in the study of unsaturated flow, and the capillary system has become one of the important methods to study relative permeability coefficient. On the assumption of using capillary system instead of soil pore, traditional water content model of capillary system was improved based on the Young-Laplace equation and fractal theory. A model predicting the relative permeability coefficient of unsaturated soil in consideration of the water content of unsaturated pore was proposed. Four groups of experimental data were used to verify the proposed model, and the root mean square deviation (RMSD) was used to evaluate the error between experimental data and predicted data. Results manifested that the RMSD values of all the four groups of data were smaller than 0.025, indicating that the model is of practical significance for predicting the relative permeability coefficient of unsaturated soil.
关键词
非饱和土 /
相对渗透系数 /
水土特征曲线(SWCC) /
毛细管系统 /
持水特征
Key words
unsaturated soil /
relative permeability coefficient /
soil-water characteristic curve(SWCC) /
capillary system /
water retention
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