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砂类材料中较大的孔隙特征决定了其内部的水分传递方式。通过Micro-CT断层扫描确定了砂的分形维数和孔隙率,根据饱和导水率和介质的孔径参数获得了Brooks-Corey模型的拟合关系,利用数值方法对垂直一维砂柱的吸渗过程进行了模拟计算,求出了毛细上升过程中的湿度分布和高度与时间的关系。在室内搭建毛细高度测定试验台,以4种粒径范围的筛分洗砂为研究对象,记录了砂中不同时刻的水分上升高度。结果表明:结合砂的扫描结构参数、进气值倒数和孔径分布指数,可较为准确地模拟砂中毛细水的吸渗过程,使得预测砂类路基材料中毛细水的运移过程具有可行性。
Larger pore characteristics of sand materials determine the internal moisture transfer. Fractal dimension and porosity of sand were determined by Micro-CT tomography. The fitting relationship of Brooks-Corey model was obtained according to the saturated hydraulic conductivity and pore size parameters of the medium. The process was simulated and the relationship between the humidity distribution and the height and the time during capillary ascent was obtained. In the laboratory, a capillary height test bench was set up to screen the sand with four kinds of particle sizes as the research object, and record the height of water rising at different times in the sand. The results show that the scanning structural parameters, the reciprocal of intake air and the pore size distribution index of sand can simulate the imbibition process of capillary water more accurately and make it feasible to predict the migration of capillary water in sand-based roadbed.