土壤膨胀性对土壤饱和水分运动参数的影响

膨胀性土壤吸水后易膨胀变形，从而影响到土壤水分的运动参数。为了研究土壤膨胀性对土壤饱和水分运动参数的影响，采用室内土柱试验装置分析了不同土壤厚度（2，4，6，8，10，15，20，25，30，35，40，45，50，55 cm）对3种土壤（沙土、黄绵土、娄土）土壤容重、土壤饱和含水量、土壤饱和导水系数的影响，并分别用幂函数、指数函数和对数函数进行了拟合分析。结果表明：① 土壤饱和膨胀率、饱和比容积、饱和含水量和饱和导水系数均随土壤厚度增加而减小。② 通过3种函数拟合效果对比发现，幂函数具有最佳拟合效果。

Influence of soil swelling on soil saturated moisture movement parameters

The expansive soil will greatly affect the movement parameters of soil moisture after absorbing water. In order to study the influence of soil swelling on soil saturated water movement parameters, indoor soil column test was conducted to analyze the influence of different soil thicknesses(2,4,6,8, 10,15,20,25,30,35, 40, 45, 50,55 cm) on soil bulk density, saturated soil water content, and saturated soil hydraulic conductivity in the terms of three types of soils (sandy soil, loess soil, and bauxite soil) and fitting analysis was performed using power, exponential, and logarithmic functions respectively. The results showed that:① Soil saturated expansion rate, saturated specific volume, saturated moisture content and saturated hydraulic conductivity all decreased with increasing soil thickness.② Through the comparison of the three function fitting effects, the power function had the best fitting effect.