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对高渗透性砂内部的低渗透性粉粘土夹层的减渗作用进行了室内垂直一维入渗试验研究。通过分析累计入渗量I、累计入渗时间t、湿润锋推进距离z之间的关系,定性阐述了粗砂中的粉粘土夹层的减渗作用,其结果表明:粗砂中的粉粘土夹层使水的入渗率和湿润锋的推进速度明显减小,并且将均质中的非线性入渗过程变为夹层内的线性入渗过程,使夹层范围的入渗成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。
The vertical one-dimensional infiltration experiment on the infiltration of low-permeability silty sand interbed in high-permeability sand was carried out. Through the analysis of the relationship between cumulative infiltration I, cumulative infiltration time t and wetting front pushing distance z, the paper describes qualitatively the seepage-reducing effect of the silt in the grit, and the results show that the intercalation of the silt in the grit The infiltration rate of water and the advancing speed of wetting front are obviously reduced, and the non-linear infiltration process in homogeneity becomes the linear infiltration process in the interlayer to make the infiltration of the interlayer range into one with less infiltration Rate and wetting front of the smaller stage of the steady infiltration stage.