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本文对宁夏膨胀土进行了膨胀变形试验．结果表明，膨胀土的膨胀变形受含水量、干密度和压力的影响．膨胀量是含水量的线性函数，膨胀量的对数与压力的对数呈直线相关．这一结果应用于工程实践中，简化了膨胀土地基的膨胀量的计算公式，得到了较好的结果．
In this paper, the expansion deformation test of expansive soil in Ningxia was carried out. The results show that the expansion deformation of expansive soil is affected by the water content, dry density and pressure. The amount of expansion is a linear function of water content, and the logarithm of the amount of expansion is linearly related to the logarithm of the pressure. This result was applied to engineering practice, simplified the calculation formula of the expansion volume of the expansive soil foundation, and obtained good results.