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洗砂柱一维毛细吸渗过程数值模拟和试验研究

, PP. 34-40

Keywords: 道路工程,路基材料,Micro-CT,Brooks-Corey模型,毛细吸渗,高度

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Abstract:

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。

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