中文摘要：

土-水特征曲线（SWCC）描述了土体吸力与含水率之间的关系，是非饱和土力学研究的重要内容。从理论和试验两个方面研究了土-水特征曲线和渗透曲线的相互关系。在理论上，应用自然比例法则研究了土-水特征曲线和渗透曲线的特征，从物理和力学意义两个方面探讨了土-水特征曲线及其导数、渗透曲线、颗粒分布曲线之间的特征，给出了土-水特征曲线和渗透曲线两指数函数表达式幂的取值范围和相互关系。试验研究结果表明：土体的土-水特征曲线受到土体的物质成分、塑性指数、孔隙结构、应力状态等多种因素影响，土体持水特性研究对工程建设具有重要的指导意义。

英文摘要：

Soil-water characteristics curve （SWCC） describes mainly the relationship of suction and volumetric water content of nonsaturated soil; it is very important to research the fundamental properties of SWCC. The relationship between SWCC and nonsaturated seepage curve has been studied based on theory and experiment, the features of SWCC and of nonsaturated seepage curve are studied by natural proportional rule; then the characteristics among SWCC and its differential curve, nonsaturated seepage curve, grain distribution curve are researched in physics and mechanics; the scope of constant index of SWCC and of nonsaturated seepage function is given; and their relationship is described. The experimental results show that the SWCC is influenced by lots of factors, such as： material compositions, plastic index, porous structure and stress state. The study of SWCC is very important to engineering construction.