关键词: 土壤膨胀性, 土壤水分运动, 土壤容重, 土壤饱和含水量, 土壤饱和导水系数

Abstract: 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.

Key words: soil expansion, soil moisture movement, soil density, soil saturated moisture content, saturated hydraulic conductivity of soil