【摘要】 针对用液氮或液态CO2对建筑物地基实施冻结处理的相变传热问题，进行了计算机数值模拟研究。相变导热方程采用了显热容法进行分析处理。采用自编程序对单管冻结速度、土壤容积含水率的影响和冷冻管布置方式的优化等问题进行了计算研究。最后针对某一实际工程应用给出了冷冻管布置的优化方案。更多还原

【Abstract】 An numerical study has been conducted for the phase-changed Stefan problem in the freezing process of shaft support in earth with Iiquid nitrogen or liquid carbon dioxide va porizing means. The method of equivalent specific heat was adopted during the discretization of the non-linear equation of conduction. With the developed code the performances of single cooling tube and multiple cooling tubes have been investigated. In addition, an optimized result to the arranging pattern of the cooling tubes for an actual project is presented.更多还原