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本文通过室内模拟试验，得出了西安黄土掺加一定量硫酸钠的硫酸盐渍土在不同初始干密度下的盐胀规律。规律表明：同一初始含水量下的硫酸盐渍土，在降温时其盐胀量与初始干密度的关系大致呈二次抛物线型，存在一个最低盐胀值区间，在本试验条件下，当含水量为重型击实标准最佳含水量时，该区间处于１．８０ｇ／ｃｍ￣３的范围内。该区间的发现对盐渍土地区的公路工程具有重要作用。通过试验成果分析得出了不同初始干密度条件下的盐胀机理，揭示了盐胀率随不同初始干密度而变化的本质。
In this paper, through indoor simulation test, the salt expansion law of sulfate loam soil with different initial dry density of Xi’an loess with a certain amount of sodium sulfate was obtained. The law shows that the relation between the amount of salt expansion and the initial dry density of sulphate saline soil with the same initial water content is roughly quadratic parabola and there exists a minimum salt expansion interval. Under this test condition, When the water content is the best water content for heavy compaction standard, the interval is in the range of 1.80g / cm ~ 3. The discovery of this interval plays an important role in highway engineering in saline soil areas. Through the analysis of experimental results, the mechanism of salt expansion under different initial dry densities was obtained, and the essence of the change of salt expansion rate with different initial dry densities was revealed.