水分迁移对岛状冻土区埋地管道周围非稳态温度场的影响

多年冻土岛大多处于连续多年冻土和季节性冻土的过渡地带,沼泽化现象很普遍,对土壤热交换条件极其敏感。结合岛状冻土区土质条件及环境因素,建立饱和冻土多孔介质水热耦合模型并进行数值计算,研究水分迁移、冰水相变对冻土温度场和埋地原油管道非稳态传热的影响。对控制和减少因管基融沉导致的安全事故,保障管道长期稳定运营具有现实指导意义。

Effect of Moisture Migration on Unsteady Temperature Field Around the Buried Pipeline in Island Permafrost Regions

Most permafrost islands are in the transition zone of continuous permafrost soil and seasonal frozen soil, swamp phenomenon is relatively common, the soil is sensitive to heat transfer conditions. In this paper, based on island frozen soil conditions and environmental factors, hydrothermal coupling model of water saturated porous media of permafrost soil was established, and the numerical calculation was carried out. The influence of moisture migration and ice-water phase change on frozen soil temperature field and buried oil pipeline unsteady heat transfer was studied.