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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.
The unfrozen water content in soil affects the physical and mechanical properties of frozen soil and is also an important index to evaluate the moisture migration in frozen soil. The unfrozen water content of Lanzhou loess with different concentrations of sodium sulfate solution was tested by nuclear magnetic resonance The effects of temperature and salinity on the content of unfrozen water were also analyzed.Meanwhile, the liquid-plastic limit of loess under different salt content and the freezing temperature of soils under liquid-plastic limit moisture content were tested, The unfrozen water content is compared with the measured value, and the parameter values of the power function equation wu = at-b with different salinity are given. Based on this, the values of -5, -10, -15 and -20 ℃ under uncooled water content with the variation of salt content, established four temperature range of different salt content of unfrozen water - salt fitting formula.