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Theoretical model of hydraulic conductivity for frozen salineon-saline soil based on freezing characteristic curve

机译：基于冷冻特性曲线的冷冻盐水/非盐土水力传导性理论模型

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摘要

The hydraulic conductivity of frozen soil has significant effects on the moisture and solute migration and on the ice segregation in frost heave when the soil is being frozen. In this study, in accordance with the thermodynamic theory of unfrozen water film, the variation of chemical potential energy of water film due to salt and soil particles is considered. It is highlighted that moisture migration in the frozen soil can be considered as the Darcy flow under a new equivalent water pressure control. On that basis, the expression of pore water freezing temperature and pore radius is yielded, and then the capillary bundle theory and the soil frozen characteristic curve (SFCC) are used for the frozen soil to build a theoretical model to predict the hydraulic conductivity of frozen salineon-saline soil. Through the comparison of four empirical equations and experimental data, the results achieved using our theoretical model can help to predict the hydraulic conductivity of the frozen soil. Furthermore, frozen non-saline soil achieves 12.47% the contribution of unfrozen water film to hydraulic conductivity, and frozen saline soil achieves 11.25% according to warm frozen soil from 0 to - 2 degrees C. Thus, this important channel cannot be ignored for water migration. Actually, this theoretical model gives an important parameter to the numerical simulation of frost heave in cold regions engineering, which can be referenced for the study on hydraulic conductivity of frozen salineon-saline soil.
机译：冻土的液压导电性对水分和溶质迁移产生显着影响，并且当土壤被冷冻时，霜冻冰雪中的冰偏析。在本研究中，根据未冷却水膜的热力学理论，考虑了由于盐和土壤颗粒引起的水膜的化学势能的变化。突出显示，在新的等效水压控制下，冻土中的水分迁移可以被视为达西流动。在此基础上，产生孔隙水冷冻温度和孔半径的表达，然后毛细管束理论和土壤冷冻特性曲线（SFCC）用于冻土，构建理论模型以预测冷冻的液压导电性盐水/盐水土壤。通过对四个经验方程和实验数据的比较，使用我们理论模型实现的结果可以有助于预测冷冻土壤的液压导电性。此外，冷冻的非盐水土壤达到12.47％的液压导电性的贡献，并根据温热的冻土从0到2摄氏度达到11.25％的冷冻土壤。因此，这种重要的通道不能忽视水移民。实际上，这种理论模型给出了寒冷地区工程中霜冻升降的数值模拟的重要参数，这可以参考冷冻盐水/非盐土壤液压导电性研究。

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  • 来源
    《Cold regions science and technology》 |2019年第9期|102794.1-102794.11|共11页
  • 作者

    Tang Rui; Zhou Guoqing; Jiao Wei; Ji Yukun;

  • 作者单位

    China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221008 Jiangsu Peoples R China;

    China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221008 Jiangsu Peoples R China;

    China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221008 Jiangsu Peoples R China;

    China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221008 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Frozen soil; Hydraulic conductivity; SFCC; Salinity; Unfrozen water film;

    机译：冷冻土;液压导电性;SFCC;盐度;未冷却的水膜;

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