饱和盐渍土渗透吸力的回顾及研究

    周凤玺, 王立业, 赖远明

    周凤玺, 王立业, 赖远明. 饱和盐渍土渗透吸力的回顾及研究[J]. 岩土工程学报, 2020, 42(7): 1199-1210. DOI: 10.11779/CJGE202007003
    引用本文: 周凤玺, 王立业, 赖远明. 饱和盐渍土渗透吸力的回顾及研究[J]. 岩土工程学报, 2020, 42(7): 1199-1210. DOI: 10.11779/CJGE202007003
    ZHOU Feng-xi, WANG Li-ye, LAI Yuan-ming. Review and research on osmotic suction of saturated saline soils[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1199-1210. DOI: 10.11779/CJGE202007003
    Citation: ZHOU Feng-xi, WANG Li-ye, LAI Yuan-ming. Review and research on osmotic suction of saturated saline soils[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1199-1210. DOI: 10.11779/CJGE202007003

    饱和盐渍土渗透吸力的回顾及研究  English Version

    基金项目: 

    国家自然科学基金项目 11962016

    国家自然科学基金项目 41230630

    国家自然科学基金项目 51978320

    详细信息
      作者简介:

      周凤玺(1979—),男,教授,博士生导师,主要从事岩土力学、复合材料结构力学方面的研究工作。E-mail:geolut@163.com

      通讯作者:

      王立业, E-mail:gwly1024@163.com

    • 中图分类号: TU43;TQ151

    Review and research on osmotic suction of saturated saline soils

    • 摘要: 为了能够准确地计算不同含盐量、盐类和温度条件下饱和盐渍土中渗透吸力的大小,首先从试验和理论方面对渗透吸力的研究成果做了简要的回顾;其次通过不同温度条件下氯化钠和硫酸钠溶液的电导率试验,探讨了两溶液饱和后土体渗透吸力与浓度的相互关系;最后基于分形理论和溶质电离度分别对EC模型和van't Hoff方程进行了改进,并对改进后的模型进行了相关的数值分析。试验结果表明氯化钠饱和后土体的渗透吸力与浓度呈幂函数增长关系,而饱和硫酸盐渍土的渗透吸力随浓度的增大呈指数关系。因此表现出硫酸盐渍土的渗透吸力先大于氯盐渍土,而在某一浓度之后氯盐渍土的渗透吸力大于硫酸盐渍土,且浓度值mA随温度的增大呈线性增长关系。数值分析结果表明改进后的模型能够实现复杂条件下的渗透吸力计算,且优于传统模型。
      Abstract: In order to accurately calculate the osmotic suction in saturated saline soils under different salt contents, salt types and temperature conditions, firstly, a brief review is made of the research results of osmotic suction from the test and theoretical aspects. Secondly, through the electrical conductivity tests on sodium chloride and sodium sulfate solution under different temperature conditions, the relationship between the soil osmotic suction and the concentration after saturation of the two solutions is discussed. Finally, based on the fractal theory and solute ionization degree, the EC model and van't Hoff equation are improved, respectively, and the improved model is analyzed numerically. The test results show that the osmotic suction of the soil after sodium chloride saturation has an increase of power function with the concentration, while the osmotic suction of the soil after sodium sulphate exponentially increases with concentration. Therefore, the osmotic suction of sulphate saline soil is higher than that of chlorine saline soil at first, while that of chlorine saline soil is higher than that of sulphate saline soil after a certain concentration, and the concentration value mA of intersection point A increases linearly with the increase of temperature. The numerical analysis results show that the improved model can calculate the osmotic suction under complex conditions and is superior to the traditional models.
    • 图  1   采用试验结果估算土体渗透吸力的情况

      Figure  1.   Estimation of osmotic suction of soil using test results

      图  2   基于不同方法计算土体渗透吸力的情况

      Figure  2.   Calculation of osmotic suction of soil based on different methods

      图  3   试验装置

      Figure  3.   Test devices

      图  4   不同含盐状态下溶液电导率随温度的分布情况

      Figure  4.   Distribution of electrical conductivity of solution with temperature in different salt states

      图  5   基于电导率试验结果的渗透吸力分析

      Figure  5.   Analysis of osmotic suction based on test results of electrical conductivity

      图  6   不同控制参量下渗透吸力的计算结果(T = 25℃)

      Figure  6.   Calculated results of osmotic suction under control parameters (T = 25℃)

      图  7   改进后EC模型的拟合结果

      Figure  7.   Fitting results of improved EC model

      图  8   改进后EC模型的数值分析(T = 25℃)

      Figure  8.   Numerical analysis of improved EC model (T = 25℃)

      图  9   改进后van't Hoff方程的数值分析(T = 25℃)

      Figure  9.   Numerical analysis of improved van't Hoff equation (T = 25℃)

      表  1   单一盐溶液的浓度配置

      Table  1   Concentration configuration of single salt solution

      10℃15℃20℃25℃30℃
      0.20.20.20.20.2
      0.40.40.40.40.4
      0.60.60.60.60.6
      0.80.80.80.80.8
      1.01.01.01.0
      1.21.21.2
      1.51.51.5
      1.81.8
      下载: 导出CSV

      表  2   混合盐溶液的浓度配置

      Table  2   Concentration configuration of mixed salt solutions

      y1=0.8y1=y2=0.5 y2=0.8
      mNaClmNa2SO4mNaClmNa2SO4mNaClmNa2SO4
      0.60.150.10.10.050.2
      0.80.200.20.20.0750.4
      1.00.250.60.60.200.8
      1.20.300.80.80.251.0
      注:y1=mNaCl/(mNaCl+mNa2SO4),y2=mNa2SO4/(mNaCl+mNa2SO4)
      下载: 导出CSV

      表  3   拟合参数值(π, MPa)

      Table  3   Values of fitting parameters (π, MPa)

      被拟合项α β nDf
      EC–π关系Mata0.19761.04890.342.61
      Rao0.342.588
      Arifin0.342.55
      van't Hoff式(5)0.12391.29860.342.51
      式(7)0.342.55
      下载: 导出CSV
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    • 收稿日期:  2019-08-26
    • 网络出版日期:  2022-12-05
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