基于双环渗水试验的银北地区典型包气带渗透性研究

Research on permeability of typical vadose zone in Yinbei area based on double-ring water seepage test

渗透性是包气带关键参数。本文采用双环法对银北地区3种典型的包气带进行试验。依据公式法对试验数据进行分析研究,绘制了渗水历时曲线。试验结果:沙地区的细砂渗透系为7.12 m/d。农田区的黏砂土为1.84 m/d。湖泊湿地区的砂黏土只有0.004 7 m/d。农田区的试验结果有不饱和、排气和饱和入渗三个过程,表明气体对渗透性影响很大。试验还表明双环法不能很好用于银北地区湖泊湿地的砂黏土。

Permeability is a key parameter in the vadose zone. In this paper, the double-ring method is used to test three typical vadose zones in Yinbei area. According to the one-dimensional infiltration formula, the analysis and research were carried out, and the water infiltration duration curve was drawn. Test results: the permeability of fine sand in sandy areas is 7.12 m/d. The clay-sand soil in the farmland area is 1.84 m/d. The silty clay in the lake wetland area is only 0.004 7 m/d. The water seepage test in the farmland area shows three distinct infiltration processes: unsaturated infiltration, exhaust infiltration and saturated infiltration, indicating that gas has a great influence on permeability. The test also shows that the double ring method cannot be used well for the sandy clay of lake wetlands in Yinbei area.