中空圆环形冻结管温度场发展敏感性分析

为研究中空圆环形冻结管在冻结过程中对周围环境因素的敏感性，运用有限元分析软件进行建模，分别讨论当土体的潜热、导热系数、比热改变时，中空圆环形冻结管的温度场发展规律。结果显示:导热系数的变化可以显著影响温度场的发展，随着导热系数的增加，土体达到冻结温度的时间逐渐缩短；随着比热的增大，土体降温速度减缓，最终的冻结温度也有所升高；相变潜热对温度场的发展没有显著的影响。在实际工程中，使用相应的施工方法改善冻结土体的参数，可以有效地改变冻结效率。

Analysis of Sensitivity when Temperature Field of Hollow Ring Freezing Tube Develops

In order to study the sensitivity of hollow ring freezing tube to the ambient environmental factors in freezing, the finite element analysis software was used to model and discuss the development law of the temperature field thereof when the latent heat, thermal conductivity and specific heat of the soil mass changed. The result shows that, the change of thermal conductivity can significantly affect the development of temperature field and, as the thermal conductivity increases, the time for the soil mass to reach the freezing temperature is gradually shortened; as the specific heat increases, the cooling rate of the soil decreases, and the freezing temperature at last may have a rise; the latent heat of phase change has no significant effect on the development of the temperature field.