【摘要】 欲评价埋于季节冻土区保温热管线的热工状况，首要的问题是计算管线周围土壤的非稳态温度场。本文针对双管流程集油管线的分离式保温形式，建立了计算温度场的数学模型，并采用有限差分数值理论对管线周围土壤的二线非稳态相变温度场进行了计算。更多还原

【Abstract】 In accordance with the thermal-insulation form of the double-conduit oil-gathering process flow, this article sets up the math model of calculating temperature field and calculates the two-dimensional. unstable phase-change temperature field of soil around pipeline by using the theory of limited difference value.更多还原