盐渍土中盐胀量与含盐量及竖向分布的关系研究

为研究万向鄯善库木塔格地区盐渍土的工程性质,选取有代表性的盐渍土进行室内模拟季节交替和昼夜温差变化的多次冻融循环试验,并从不同角度进行了盐胀规律的分析。结果表明:盐渍土的盐胀过程可以被分为三个阶段:随着温度的降低盐胀量急剧增加阶段；温度持续降低盐胀量保持稳定阶段；升温时盐胀量均匀下降阶段。盐胀量的最大值并不出现在土体上部，而是在地表下。当土体温度处于-5～0 ℃范围内，即第四次冻融循环时，1～4 m深度范围内的盐胀量随着含盐量的升高而升高，含盐越多，盐胀量越大。

Study on Salt Heaving versus Salt Content and Vertical Distribution in Saline Soil

To study engineering properties of the saline soils in Kumtag region, Shan Shan, Xin Jiang, the typical saline soil was selected to conduct indoor repeated freeze-thaw cycles test which simulates temperature difference varied between seasons or day and night, and then to analyze the law of salt heaving from various perspectives. The results show that salt heaving may be divided into three stages: the first stage in sharp increase with decrease of temperature, next a relatively stable stage while continuous decrease of temperature, and then the last stage in uniform decrease as temperature rises. The maximum of the salt heaving does not appear in the upper part of the soil mass, but under the ground surface. When the soil temperature is at the range of -5 ℃ to 0 ℃, i.e. in the fourth freeze-thaw cycle, the salt heaving in the depth of 1m to 4m increases as the salt content increases, the higher the salinity, the greater the salt heaving.