Abstract: Along long transmission pipeline, geology and hydrology is different, the difference of buried pipeline depth is great. The corresponding natural ground temperature and pipelines-temperature field are also different. If the average or equivalent depth is considered only, the pipeline computation will make a very big error. The use of numerical method will consider the fact that the numerical model approaches the actual frozen earth geological condition and the nonlinear characters, which appears especially important. The limited unit method was used to calculate the soil temperature field around the pipelines by three dimensional numerical compute under the different buried depth conditions. The result indicates that the pipeline temperature change is, to some extent, affected by the buried depth, especially in the frozen earth area, the temperature difference between natural soil and pipelines' surroundings is greater.

Key words: Buried depth, Buried pipeline, Soil temperature field, Frozen earth

摘要： 长输管道沿线地质、水文等条件不同，管道埋深差别较大。相应埋深处的自然地温及管道周围的温度场也不同。若只考虑平均或当量深度来进行管道计算，会产生很大误差。使用数值方法将所考虑的数值模型更接近于实际冻土地质条件和非线性特性就显得格外重要。采用有限单元法，对不同埋深条件下的管道周围土壤温度场进行三维数值计算，结果表明，管道温度变化在一定程度上受埋深影响，尤其在冻土地区，地埋温差与管道周围土壤温差较大。

关键词: 埋深, 埋地管道, 土壤温度场, 冻土