FREEZING OF SOIL WITH AN UNFROZEN WATER CONTENT AND VARIABLE THERMAL PROPERTIES
FREEZING OF SOIL WITH AN UNFROZEN WATER CONTENT AND VARIABLE THERMAL PROPERTIES
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具有未冻结水含量和可变热性能的土壤冻结
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
V. Lunardini
中科院分区：
文献类型：
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作者：
V. Lunardini
摘要：当许多材料在固定的温度下发生相变时，土壤系统表现出一定的相变区。未冻水随温度的变化导致土壤系统在有限的温度范围内冻结融化。给出了未冻水含量随温度线性和二次变化的平面层导热相变的精确解和近似解。发现温度和相变深度与恒温或诺依曼问题的预测有很大的不同。糊状区土壤的导热系数和比热随未冻水含量的变化而变化。结果表明，比热的影响可以忽略不计，而变导热系数的影响可以通过选择适当的热物性来考虑。关键词：冻土；相变；土壤。
Abstract : While many materials undergo phase change at a fixed temperature, soil systems exhibit a definite zone of phase change. The variation of unfrozen water with temperature causes a soil system to freeze of thaw over a finite temperature range. Exact and approximate solutions are given for conduction phase change of plane layers of soil with unfrozen water contents that vary linearly and quadratically with temperature. The temperature and phase change depths were found to vary significantly from those predicted for the constant-temperature or Neumann problem. The thermal conductivity and specific heat of the soil within the mushy zone varied as a function of unfrozen water content. It was found that the effect of specific heat is negligible, while the effect of variable thermal conductivity can be accounted for by a proper choice of thermal properties used in the constant-thermal-property solution. Keywords: Frozen soils; Phase change; Soils.