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中文摘要：
非饱和土水特征曲线（SWCC）表示为土体中含水量和基质吸力之间的关系曲线，是非饱和土力学领域研究的重要课题之一。针对实际工程中南广高速铁路路堑边坡黏性土，利用SWC-150 Fredlund土水特征曲线压力仪对非饱和黏土进行土水特性试验，测定非饱和黏土的含水量与基质吸力的关系，分析土一水特征曲线的基本规律。实验结果表明：该土一水特征曲线可以用一阶指数衰减函数、Sigmoidal函数和一般对数函数3种关系式进行拟合描述，对3种函数的拟合参数和相关系数进行比较可知Sigmoidal函数更适合描述该土样的土一水特征曲线。
英文摘要：
One of the key researches on unsaturated soil mechanics is SWCC, which indicates the relation curve between soil water content and matric suction. This paper analyses the basic laws of SWCC using SWC-150 Fredlund pressure cell to conduct a test in water characteristics of unsaturated cohesive soil taken from cutting slope of Nanning-Guangzhou high-speed line to determine the relation of Water content in unsaturated cohesive soil and matric suction. The result in- dicates that the SWCC can be fittingly described by employing three relational expressions first-order exponential damping function, Sigmoidal function and general log function. By comparison of fitting parameters and correlation coefficient, Sigmoidal function is known as the best to describe the SWCC of the soil sample
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