中文摘要：

季冻区盐渍土冻胀病害影响工程质量。水分、密度及盐分的变化影响季冻土冻胀特性。以吉林省农安县旱地盐渍土为研究对象，通过室内冻胀实验讨论了含水率、压实度、含盐量对盐渍土冻胀规律的影响，分析起始冻胀含水率随盐分和压实度的变化规律。试验研究表明：较大的压实度和较高的含水率有利于冻胀。土体在较低含水率和较低压实度时发生冻缩，随着含水率和压实度的增大，冻缩量减小至零，随后发生冻胀，冻胀（缩）量与含水率基本呈线性关系。因此，存在起始冻胀含水率，该值随着压实度的增大而线性减小，随含盐量的增加而整体呈增大趋势。塑限与压实度对盐渍土起始冻胀含水率的影响可以拟合出相应线性公式，随着含盐量增加，该公式的系数整体呈增大趋势。在前人总结出的公式基础上增加压实度这一参数，为后续季冻区盐渍土的冻胀特性研究提供参考与理论依据。

英文摘要：

Frost heaving hazards of saline soil in seasonal region affect engineering quality. The change of water, density and salt influences the frost heaving characteristics of seasonal soil. By taking the saline soil from dry land in Nong＇an County, Jilin province, frost heaving tests are conducted to examine the frost heaving regularity of saline soil with different water contents, compaction degrees and salt contents. Under different water contents, compaction degrees and salt contents, the changing rule of the critical water content of frost heaving of saline soil is analyzed. The research indicates that higher compaction degree and higher water content are in favor of frost heaving. In lower water content and lower compaction degree, shrinkage occurs. Shrinkage disappears and then expansion appears with the increase of water content and compaction degree. Frost heaving quantity and water content have a nearly linear relationship. Therefore, a critical water content of frost heaving exists. The critical water content decreases in a linear rule with the increase of compaction degree. But as the salt content increases, the critical water content rises generally. The influence of plastic limit and compaction degree on the critical water content of frost heaving can be fitted in a linear equation. The coefficient of the equation rises overall with the increase of salt content. On the basis of the formula summed up previously, a new parameter, compaction degree has been added, which provides reference and theoretical basis for the research of the frost heaving characteristics of seasonal saline soil in future.