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作者投稿 专家审稿 编辑办公 编委办公 主编办公

冰川冻土 ›› 2021, Vol. 43 ›› Issue (2): 497-509.doi: 10.7522/j.issn.1000-0240.2021.0045

• 寒区工程与灾害 • 上一篇    下一篇


姜浩1,2(), 邴慧1,2()   

  1. 1.中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
  • 收稿日期:2020-09-23 修回日期:2020-12-10 出版日期:2021-04-30 发布日期:2021-05-18
  • 通讯作者: 邴慧 E-mail:jianghao2018@nieer.ac.cn;binghui@lzb.ac.cn
  • 作者简介:姜浩,硕士研究生,主要从事盐渍土物理力学性质研究. E-mail: jianghao2018@nieer.ac.cn
  • 基金资助:

Experimental and theoretical study on soil-water characteristic curve of sodium sulfate saline soil

Hao JIANG1,2(), Hui BING1,2()   

  1. 1.State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2020-09-23 Revised:2020-12-10 Online:2021-04-30 Published:2021-05-18
  • Contact: Hui BING E-mail:jianghao2018@nieer.ac.cn;binghui@lzb.ac.cn



关键词: 土-水特征曲线, 滤纸法, 硫酸钠盐渍土, 基质吸力, 含盐量


Soil-water characteristic curve (SWCC) is a curve describing the relationship between soil matric suction and water content, which is the core of unsaturated soil mechanics research. Matric suction is an important stress state variable of unsaturated soil, which controls the balance between soil structure and shrinkage membrane, and is an important factor affecting mechanical properties of unsaturated soil. Loess containing sodium sulfate is widely distributed in Northwest China, and has been widely used in engineering practice. The relationship between the matric suction of loess and the content of sodium sulfate is studied by experimental test and theoretical analysis, and the law of the matric suction of loess like sodium sulfate saline soil affected by sodium sulfate is obtained. Taking the typical sodium sulfate contained in loess in Northwest China as the variable factor, the matric suction of Lanzhou loess and sodium sulfate saline soil with different salt content was measured by filter paper method, and the soil water-characteristic curve was drawn. The results show that the existence and content of sodium sulfate have a great influence on the matric suction of loess, and the higher the salt content of sodium sulfate saline soil is, the greater the matric suction is. The influence of sodium sulfate on the matric suction of loess is different under different water content: when the water content is high, the influence of sodium sulfate on the matric suction of loess is small; when the water content is low, the influence of sodium sulfate on the matric suction of loess is great. Based on unsaturated soil mechanics theory and surface physicochemical theory, assuming that the salt solution in soil does not affect the pore structure of soil, considering the influence of salt solution in soil on the capillary part and adsorption part of matric suction, a semi empirical formula is obtained, which can be used to calculate the relationship between salt content in soil and matric suction. The Kelvin radius and the thickness of adsorbed water film corresponding to each suction in the formula are calculated by the method introduced in unsaturated soil mechanics. The measured data are used to fit the three parameters in the formula. The matric suction corresponding to each water content of sodium sulfate saline soil with different salt content is calculated by the semi empirical formula, and the soil-water characteristic curve is drawn. The results show that the calculated curve is in good agreement with the experimental curve, which shows that the formula can well describe the relationship between different salt content and matric suction in saline soil. In this paper, the law of the influence of sodium sulfate content on the matric suction of loess is obtained through experiments, and the law is expressed quantitatively by theoretical derivation and semi empirical formula, which provides certain theoretical basis and data support for the future engineering practice in this area. The semi empirical formula obtained in this paper can also be applied to the calculation of soil-water characteristic curve of other saline soils, but it should be noted that the formula will not be applicable when the concentration of salt solution in soil reaches the saturation concentration.

Key words: soil-water characteristic curve, filter paper method, sodium sulfate saline soil, matric suction, salt content


  • TU448