基于冻土区土壤带相变的传热过程建立了埋地管道周围土壤温度场的二维计算模型，采用数值方法对其进行了求解，并模拟了在不同油温、不同保温层厚度与不同土壤含水量等因素影响下管道运营期内管道周围土壤的温度变化。研究结果表明，采用等效热容法能较好地处理冻土相变问题并能有效地应用于埋地管道周围土壤所受热力影响的计算，能够为预测管道运营期内周围土壤的融化范围提供技术支持。
A two-dimensional computational model of the temperature fields of soil around the buried pipeline was established based on the process of heat transfer with phase change in the soil in permafrost regions. It was studied using numerical methods and the changing temperature of the soil around the pipeline within operation life cycle was simulated under the influence of various oil temperatures, insulation layer thicknesses and water contents of soils. The results indicated that equivalent heat capacity method can effectively deal with phase change problem in the soil, and can be applied to determine the thermal effect on the soil around the buried pipeline. It may provide support for predicting the thaw size of the soil around the pipeline within operation life cycle.
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