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通过测定在较大负温范围内对应不同总含水量、不同土中溶液初始浓度的含氯化钠盐兰州砂土、兰州黄土及内蒙粘土的未冻水含量,发现在总含水量和土中溶液初始浓度达到适当组合后,土中溶液随温度降低有明显的二次相变发生。二次相变发生的温度随土颗粒的变细而降低,随总含水量或土中溶液初始浓度的增大而升高。本文在大量试验的基础上,确立了二次相变发生的温度与总含水量及土中溶液初始浓度之间的定量关系。
By measuring the unfrozen water content of NaCl-containing salt Lanzhou sand, Lanzhou loess and Inner Mongolia clay with different total water content and initial concentrations of different soil solutions in the larger negative temperature range, it was found that in the total water content and soil After the initial concentration of the solution reached the appropriate combination, the solution of soil with obvious secondary phase transition occurred with the decrease of temperature. The temperature at which the second transformation takes place decreases with soil thinning and increases with the total water content or the initial concentration of the solution in the soil. Based on a large number of experiments, this paper establishes the quantitative relationship between the temperature of the secondary transformation and the total water content and the initial concentration of the solution in the soil.