【摘要】 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。更多还原

【Abstract】 In this paper,a set of salt heaving laws of sulphate salty soils made of 3%Na₂SO₄ with Xi′an-loess at different dry densities is obtained through simulation test.Thelaws demontrate that the relation between the salt heaving value of sulphate salty soil andthe initial dry density presents a parabolic trend when the temperature is decreased form +25℃ to -15℃ at constant initial water content and there is an interval of minimum valuewhich is of the range of 1. 8g/cm￣3 at the best water content value by the heavier compactionstandard as in this simulation test. The finding of the minimum value interval of saline soil issignificant to highway engineering in saline soil region.The test result also reveals the saltheaving mechanism in sulphate salty soil under different initial dry density.It shows why sul-phate salty soil heaving ratio changes with the initial dry density.更多还原