Effects of water/salt phase transition on matric suction of sulfate saline soil
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摘要: 硫酸盐渍土是中国西北寒旱区盐渍土的主要类型，在温度变化过程中，水分和盐分的相变会引起盐渍土基质吸力发生改变。以硫酸钠盐渍黄土为研究对象，探究了降温过程中的水盐相变对土体基质吸力的影响规律。结果表明：当土体尚未发生相变时，土体的基质吸力随温度的降低线性增加，而当土体中存在冰或者水合盐结晶时，土体的基质吸力在相变点处发生突变，盐渍土的基质吸力与土体的液态水含量息息相关。由于硫酸钠盐渍土在降温过程中会发生二次相变，二次相变使得盐渍土的基质吸力在二次相变点处同样产生突变，二次相变量的多少也会直接影响土体基质吸力的增加量。基于试验结果，进一步分析了不含盐素土基质吸力的预测方法，并讨论了硫酸钠盐渍土在冻结过程中的水分迁移驱动力。该研究不仅为深刻理解盐渍土水分迁移驱动力提供重要的参考，而且为盐渍土多场耦合理论的发展提供借鉴。
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关键词:
- 硫酸盐渍土 /
- 基质吸力 /
- pF meter /
- 相变 /
- Clapeyron方程
Abstract: The sulfate saline soil is the main type of saline soil in cold and arid regions of Northwest China. As the environmental temperature changes, the ice formation and salt crystallization may change the matric suction of saline soil. The effects of water/salt phase transition on the matric suction of soil are investigated. The results show that the matric suction of soil linearly increases with the decreasing temperature before the phase transition occurs, and when ice forms or salt hydrate crystallizes in the soil, the matric suction of saline soil changes abruptly at the phase transition point. The matric suction of saline soil is closely related to the liquid water fraction of soil. Because the second phase transition occurs in the sulfate saline soil during cooling, the matric suction of saline soil also has a sudden change at the eutectic point, and the amount of the second phase transition directly affects the value of matric suction. Based on the experimental results, the prediction method for the matric suction of desalinized soil is further analyzed, and the water migration driving force of sodium sulfate saline soil is discussed during the freezing process. This study is helpful for the deep understanding of water migration driving force of saline soil and provides a reference for the development of multi-physical field coupling theory of saline soil.-
Keywords:
- sulfate saline soil /
- matric suction /
- pF meter /
- phase transition /
- Clapeyron equation
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图 4 无盐土体未冻水含量与基质吸力的变化规律
Figure 4. Variation of unfrozen water content and matric potential in desalinized soil
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图 5 盐分结晶对基质吸力的影响
Figure 5. Effects of salt crystallization on matric suction of soil samples
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图 6 二次相变过程中基质吸力的变化
Figure 6. Variation of matric suction during secondary phase transition process
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