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【目的】盐渍土中的盐分结晶吸水使得未冻水含量发生变化，为探究含盐量较高的盐渍土中硫酸钠对未冻水含量的影响，【方法】通过室内试验系统研究了温度、初始含水率、土壤类型及含盐量等因素对未冻水含量的影响。根据质量守恒原则，构建了不同含盐量条件下的未冻水模型。【结果】结果显示：相同含水率条件下，含盐量越高，盐渍土在温度达到冻结温度时未冻水含量越低。相同负温条件下，冻结过程未冻水含量高于融化过程未冻水含量，且冻融过程中未冻水含量随温度的变化存在“滞后”现象。【结论】结果表明：构建的未冻水含量预测模型，考虑了盐分析出阶段和冰盐共晶阶段，量化了盐分结晶析出的水量，更适用于高含盐量盐渍土未冻水含量的预测，为西北寒旱地区的农业发展及工程建设提供了科学依据。
Abstract：[Objective]Salt crystallization in saline soil absorbs water, leading to changes in unfrozen water content. To investigate the effect of sodium sulfate on the unfrozen water content in saline soils with higher salt content.[Methods]A systematic laboratory experiment was conducted to study the influence of factors such as temperature, initial water content, soil type, and salt content on the unfrozen water content. A model for unfrozen water under different salt content conditions was constructed based on the principle of mass conservation.[Results]The result showed that under the same water content conditions, the higher the salt content, the lower the unfrozen water content in saline soil when the temperature reached the freezing point. Under the same negative temperature conditions, the unfrozen water content in the freezing process was higher than in the melting process. Furthermore, a hysteresis was observed in the change in unfrozen water content with temperature during the freezing and thawing process.[Conclusion]The constructed model for predicting unfrozen water content considers the salt crystallization stage and the ice-salt eutectic stage and quantifies the water released by salt crystallization, making it more suitable for predicting the unfrozen water content in high-salt saline soils. This provides scientific support for agricultural development and engineering construction in the cold and arid regions of Northwest China.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2025.12.016
中图分类号:TU448
引用信息:
[1]李泽权,孙利英,柴明堂,等.硫酸钠盐渍土未冻水计算模型构建及验证[J].水利水电技术(中英文),2025,56(12):205-215.DOI:10.13928/j.cnki.wrahe.2025.12.016.
基金信息:
国家重点研发计划(2021YFD1900600); 宁夏重点研发项目(引才专项)(2023BSB03021); 宁夏教育厅高等学校科学研究项目(NYG2024049); 宁夏自然科学基金项目(2023AAC05014)