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该文是有关非饱和承载土起始冻融温度的研究成果。 本文指出了判定湿土起始冻结温度传统方法的缺点,在前人的基础上,提出用电势跃变作为判定湿土起始冻结温度的准则。从理论和实验上论证了电势的首次跃变是湿土发生相变的程度足以引起宏观性质改变的表征;并将其推广到冻土融化情况。 基于以上观点,笔者系统地测定了湿土在各种情况下的起始冻融温度;并给出了湿土起始冻融温度与诸因素的定量关系。实验中,笔者将湿土开放系统的压力从历史上的最大压力1.5PMa提高到4MPa,而湿土封闭系统的压力则高达10MPa。文中的结论和前人的研究相比较有较高的精度且更适用于工程实践。
This article is about the initial freezing and thawing temperature of unsaturated bearing soil. This paper points out the shortcomings of the traditional method for determining the initial freezing temperature of wet soils. Based on previous studies, the potential jump is used as a criterion for determining the initial freezing temperature of wet soils. Theoretically and experimentally, it was demonstrated that the first transition of potential is the characterization of the degree of phase transition in wet soil that is sufficient to cause the change of macroscopic properties, and it is extended to the thawing of frozen soil. Based on the above points of view, the author systematically measured the initial freezing-thawing temperature of wet soil under various conditions, and gave a quantitative relationship between the initial freeze-thaw temperature of wet soil and various factors. In the experiment, the author raised the pressure of wet soil open system from the historical maximum pressure of 1.5PMa to 4MPa, and the pressure of wetland closed system was as high as 10MPa. The conclusions in this paper are more accurate than previous studies and are more applicable to engineering practice.