The liquid water fraction is one of the most important parameters in the study of saline soils of cold regions, and has great influence on water migration. The freezing temperature and saturated concentration of pore solutions have been investigated according to thermodynamic theory, indicating that pore radius, temperature, and salt concentration are the three main influencing factors. Here, a method for calculating the liquid water fraction of saline soil is proposed, in which the liquid water fraction of saline soil can be calculated for different water contents and initial salt concentrations according to the pore size distribution. Comparison of the experimental data with the results of the model shows that the model provides reasonable calculations for the unfrozen water content of saline frozen soils, and both the first and the second phase transition can be modeled well. Considering the solubility of salt, the amount of salt crystallization and ice formation during cooling can also be obtained. The proposed method can be used to distinguish the proportion of salt expansion and frost heave, and also provide a novel approach for calculating the matric suction of saline soil during the freezing process.

中文翻译：

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冻结过程中盐渍土的液态水分数的计算方法

液态水分数是研究寒区盐渍土的最重要参数之一，对水分迁移有很大影响。根据热力学理论研究了孔隙温度的冻结温度和饱和浓度，表明孔隙半径，温度和盐浓度是影响孔隙率的三个主要因素。在此，提出了一种计算盐渍土壤的液态水分数的方法，其中可以根据孔径分布针对不同的水分含量和初始盐浓度计算出盐渍土壤的液态水分数。实验数据与模型结果的比较表明，该模型为盐渍冻土的未冻水含量提供了合理的计算方法，第一和第二相变都可以很好地建模。考虑到盐的溶解度，也可以获得冷却期间盐的结晶量和冰的形成。所提出的方法可用于区分盐分膨胀和冻胀的比例，也为计算冷冻过程中盐渍土的基质吸力提供了一种新的方法。