Abstract:

The occurrence of permafrost thawing settlement would lead to soil sliding to its base along slope when the pipeline was in slope segment, which lead to form a thawing landslide, and the stress distribution of the buried pipelines located in permafrost zone ramping portion had greatly affected, and might lead to pipeline stress concentration even plastic deformation phenomenon. For buried pipelines in the slopes with different angles and the length of permafrost thawing settlement, stress changes of pipeline numerically when affected by thawing landslide and thawing settlement were simulated. The study found that different positions pipeline showed different forms of stress when it was affected by thawing landslide, and stress magnitude generated by the pipeline at different locations affected slope angles. The results provided a better theoretical basis for the safe operation and construction of the building buried pipelines.

Key words: Permafrost regions, Buried pipeline, Stress of pipeline, Thawing landslide, Numerical calculation

摘要： 位于冻土区斜坡带的埋地管道,当冻土发生融沉现象时,因土体沿斜坡向坡底滑动形成冻融滑坡,其应力分布受到很大影响,可能会导致管道应力集中甚至塑性变形的现象。针对位于角度不同的冻土区斜坡带的埋地管道,当管道受到冻土融沉和冻融滑坡影响时,对管道的应力变化情况进行了数值模拟,分析了斜坡带埋地管道的应力分布,研究了斜坡角度和融沉长度对管道应力的影响。研究发现,受到融沉滑坡影响,管道不同位置呈现不同的应力形式,且斜坡角度影响不同位置管道所产生的应力。研究结果可为埋地管道的安全运行与施工建设提供理论依据。

关键词: 冻土区, 埋地管道, 管道应力, 融沉滑坡, 数值模拟