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冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 963-969.doi: 10.7522/j.issn.1000-0240.2016.0110

• 岩土试验与测试技术 • 上一篇    下一篇

硫酸钠盐渍土未冻水含量的实验研究

马敏1 2, 邴慧1, 李国玉1   

  1. 1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点试验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2016-01-25 修回日期:2016-07-21 出版日期:2016-08-25 发布日期:2016-09-19
  • 通讯作者: 邴慧,E-mail:binghui@lzb.ac.cn. E-mail:binghui@lzb.ac.cn
  • 作者简介:马敏(1991-),男,甘肃泾川人,2013年毕业于兰州交通大学,现为中国科学院寒区旱区环境与工程研究所在读硕士研究生,从事冻土物理学方面的研究.E-mail:mamin@lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(41371090;41672310);甘肃省科技重大专项计划项目(143GKDA007);冻土工程国家重点实验室自主课题(SKLFSE-ZT-08)资助

Experimental research on unfrozen water content of sodium sulphate saline soil

MA Min1 2, BING Hui1, LI Guoyu1   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-01-25 Revised:2016-07-21 Online:2016-08-25 Published:2016-09-19

摘要: 土体中的未冻水含量影响冻土的物理力学性质,也是评价冻土中水分迁移的重要指标.利用核磁共振技术对含有不同浓度硫酸钠溶液的兰州黄土的未冻水含量进行测试,并分析了温度、含盐量对未冻水含量的影响.同时,测试了不同含盐量下黄土的液塑限及液塑限含水率下土体的冻结温度,计算了不同含盐量下的未冻水含量并与实测值进行比较,给出了不同含盐量下幂函数方程wu=at-b中的参数值.在此基础上,分析了-5、-10、-15和-20℃条件下未冻水含量随含盐量的变化规律,建立了4个温度下不同含盐量区间的未冻水-含盐量拟合公式.

关键词: 硫酸钠, 盐渍土, 未冻水含量, 液塑限, 核磁共振

Abstract: Unfrozen water content not only influences the physical and mechanical properties of frozen soil, but also is an important evaluation index of water migration. The moisture content of Lanzhou loess which contains different concentrations of sodium sulfate was measured by pulsed nuclear magnetic resonance (NMR). The influence of temperature and salinity on the unfrozen water content was analyzed. We simultaneously test the liquid and plastic limits of the samples containing different concentrations of sodium sulfate, and the freezing points of different water content of liquid and plastic limit. Based on the above data, the unfrozen water content was calculated according to wu=at-b so as to compare with the test value and the fitting parameters of the power function formula are also figured out. Then the temperature: -5℃, -10℃, -15℃ and -20℃ are chosen to analyze the relationship between unfrozen water content and salt content. The result shows that the change of unfrozen water content is not obvious in the mass, but the value becomes a maximum when the salt content is 2%. As a result, the fitting formulas based on different salinity ranges are established at the above temperature.

Key words: sodium sulphate, saline soil, unfrozen water content, liquid and plastic limit, nuclear magnetic resonance

中图分类号: 

  • P642.14/TU411