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Influence of plasticity on unfrozen water content of frozen soils as determined by nuclear magnetic resonance

机译：核磁共振法测定可塑性对冻土未冻结水分的影响

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摘要

The mechanical properties of frozen soils are closely related to the unfrozen water content. It has been generally recognized that the unfrozen water content varies with plasticity of soils, while the quantitative relationship between the plastic index and the unfrozen water content is yet to be further examined. This paper takes soil samples with different plasticity as study objects, which are prepared from two typical soil materials, i.e., the Chinese ISO standard sand and bentonite. Nuclear magnetic resonance (NMR) is used to measure the unfrozen water content of soil samples under different temperatures. Test results show that there are three stages in the soil-freezing characteristic curve (SFCC), i.e., the super-cooling stage, the rapid-drop stage and the stable stage. With the increase of the plasticity index, the super-cooling stage is less significant, while the curve in the rapid-drop stage becomes gentler. In the stable stage, the unfrozen water content is barely affected by plasticity. A piecewise function consisting of a linear formula and a power formula is then proposed to describe the SFCC, where the formula parameters are functions of the plastic index. It is found that the unfrozen water content calculated by the proposed formula agrees with the measured results.
机译：冻土的机械性能与未冻水含量密切相关。人们普遍认识到，未冷冻的水含量随土壤的可塑性而变化，而塑性指数和未冷冻的水含量之间的定量关系还有待进一步研究。本文以具有不同可塑性的土壤样品为研究对象，这些样品是由两种典型的土壤材料即中国ISO标准砂和膨润土制成的。核磁共振（NMR）用于测量不同温度下土壤样品的未冻结水分。试验结果表明，土壤冰冻特征曲线（SFCC）分为三个阶段，即过冷阶段，速降阶段和稳定阶段。随着可塑性指数的增加，过冷阶段的重要性降低，而快速下降阶段的曲线变得更平缓。在稳定阶段，未冻结的水分几乎不受可塑性影响。然后提出了由线性公式和幂公式组成的分段函数来描述SFCC，其中公式参数是塑性指标的函数。结果表明，该公式计算出的未冻结水含量与实测结果吻合。

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