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分析了非饱和土路基的毛细作用机理,探讨了毛细作用对路基湿度及强度的影响,基于达西定律及质量守恒定律,建立了描述非饱和土毛细作用的水分运动方程。通过引入算例,得到了非饱和土路基毛细作用下的湿度变化规律及毛细水上升高度,最后研究了不同因素包括路基高度、初始填筑含水量、渗透系数等影响下的非饱和土路基的毛细作用。结果表明,提高路基高度可以减小毛细作用对路基整体湿度的影响;初始填筑含水量越大,毛细作用越明显;路基填土的渗透性越好,毛细水上升速度越快;不同填土类型所表现出来的毛细作用与填土本身的土水特性有关。
The capillary action mechanism of unsaturated soil subgrade is analyzed. The influence of capillary action on the subgrade humidity and strength is discussed. Based on Darcy’s law and the law of mass conservation, a water movement equation describing the capillary action of unsaturated soil is established. By introducing an example, the law of capillary action and capillary height rise of unsaturated soil subgrade were obtained. Finally, the influence of different factors including subgrade height, initial water content and permeability coefficient on unsaturated soil subgrade Capillarity. The results show that increasing the subgrade height can reduce the effect of capillary action on the whole subgrade humidity. The larger the water content, the more obvious the capillary effect. The better the permeability of subgrade fill, the faster the capillary water rise. The capillary effect exhibited by the type is related to the soil-water properties of the fill itself.