关于土水特征曲线滞回特性影响因素的研究

A research of affect factor on hysteresis behavior for soil-water characteristic curve

研究土水特征曲线是研究非饱和土的关键。通过GCTS土水特征曲线仪,对不同初始干密度、干湿循环次数和不同应力条件下的非饱和土土水特征曲线进行了测定,利用已经提出的滞回度的概念,计算了各种条件下土的滞回度值并对试验的拟合曲线进行了分析,研究了影响土水特征曲线滞回特性的因素,理论上对其产生这种因素的原因进行了定性分析,分析表明,土水特征曲线滞回特性的性状可归结为孔隙体积的变化,这些成果将更有利的指导非饱和土特性的研究。

The research of soil-water characteristic curve(SWCC) will become the key of unsaturated soil.A test is carried out by GCTS SWCC device for soil water characteristic curve for different initial dry densi-ty,drying-wetting cycle and different stress conditions. We calculate the hysteresis degrees of soil duringvarious measurement conditions,using the concept has proposed hysteretic degrees. On the fitted curve ofexperiments were analyzed to study the factors that effecting hysteresis characteristics of soil water character-istic curve. The causes of such factors are discussed theoretically. It shows that hysteresis characteristic ofsoil water characteristic curve can be traced to the change of the pore volume and these results will bemore favourable guidance on unsaturated soil properties.