永冻区埋地热油管道热力计算

THERMAL CALCULATION OF BURIED OIL PIPELINE IN PERMAFROST ZONE

埋地热油管道通过永冻地带时 ,会导致土壤解冻 ,进而导致管道沉陷和土壤物性参数变化。分析管道周围土壤融化圈变化对管道系统的设计、施工和管理是必需的。考虑热油管道对其周围土壤的影响和半无穷大土壤的传热 ,提出了描述永冻地区土壤融化圈变化的数学模型。通过一定的数学处理得到了计算融化圈的特征线方程 ,并采用差分法进行求解特征线方程 ,获得了满意的结果。计算分析表明 ,这一方法是可行的。

The warm oil will produce thawing of ice rich soil adjacent to the pipeline when it crosses through permafrost zone, resulting in thaw settlement of the pipeline and variation of soil properties. Therefore, it is necessary for us to calculate on thaw bulb growth below a warm buried pipeline for pipeline design, construction and management. According to the effect of hot pipeline on the soil and the heat transmission of semi - infinite soil, the paper presented a mathematical model that analyzed the thaw bulb. The characteristic equation of calculating the thaw bulb was drawn by mathematical simplification, and a satisfied solution was obtained by difference method. The method in this paper is proved feasible by a practical example.