砂土中粘土夹层对入渗过程影响的试验分析

Effect of Clay Interlayer on Infiltration Process in Sand

对水在高渗透性砂内入渗过程中,其内部的低渗透性粘土夹层对入渗过程的影响进行了室内垂直一维入渗试验。通过分析定性得出粘土夹层对入渗过程的影响体现为减渗作用,表现为粘土夹层将均质粗砂中的非线性入渗过程变为夹层内的线性入渗过程,使夹层范围的入渗为一个具有较小入渗率和较小湿润锋推进速度的稳渗阶段。

This paper deals with the effect on infiltration process of clay interlayer in sand by lab experiments on water infiltration into sand column that contains a clay interlayer.By analyzing experiment data,a conclusion is drawn that the effect is infiltration reduction,which can be explained as following： clay interlayer converts the non-linear process in sand into linear process of infiltration in clay interlayer.This results in the infiltration process of clay layer to be a stable infiltration stage with a smaller infiltration rate and a slower advance speed of wetting front.