管道埋深对冻土区土壤温度场的影响

管道埋深对管道周围土壤温度场及管道的热力特性有重要的影响，埋深不同，相对应的管道周围土壤的温度场也不同。对埋深不同的埋地管道周围土壤温度场进行了数值模拟，并选用水热耦合模型和传热模型进行了计算。对通过两种模型得到的计算结果进行了分析。结果表明，埋深对埋地管道周围土壤温度场有一定的影响，水分迁移和冰水相变对埋地管道的温度分布也有一定的影响；埋深不同时，水分迁移和冰水相变对土壤温度场的影响也不同，管道埋深越浅，通过两种模型计算得到的相同点处的温度相差越大。为了得到更接近于实际的计算结果，应该考虑水分迁移和冰水相变，计算时应考虑水热耦合问题。

Influence of Pipeline Buried Depth on Soil Temperature Field in Permafrost Regions

Buried depth of pipeline has important effects on the temperature field and thermal characteristics of soil around the pipe.Corresponding to different buried depth,the temperature field of soil around pipeline was also different.With different buried depth of pipeline,the temperature field of soil around the pipeline was simulated and calculated by using water thermal coupling model and heat transfer model.The analysis of the calculation results of two models showed that the embedded depth had certain influence on the temperature field of soil around the buried pipeline,and so do moisture migration and the water phase transition.Comparing with the temperature difference obtained by the two kinds of models in the same temperature,the results show that with different buried depth,the influence of moisture migration and the water phase change also had different influence on the soil temperature.The shallower the buried depth of pipeline was,the bigger the difference of temperature of the two models in the same place was.In order to get actual calculation results,the moisture migration and the water phase as well as water heat coupling problems in calculating should be considered.