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《Journal of Glaciology and Geocryology》 2008-02
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Non-linear Analysis of Temperature Fields around the Buried Oil-pipeline in Permafrost Regions,Northeast China

HE Shu-sheng1,2,YU Wen-bing1,CHEN Wen-guo2,YU Zhi-feng2,JIN Hui-jun1(1.State Key Laboratory of Frozen Soil Engineering,CAREERI,CAS,Lanzhou Gansu 730000,China;2.China Petroleum Pipeline Engineering Corporation,Langfang Hebei 065000,China)  
Based on the governing differential equations of the transient problem of temperature fields with phase change,the two-dimensional finite element formula of temperature fields around a buried pipeline in permafrost regions are obtained by using Galerkin's method.The soil temperature fields around the heated pipeline with and without insulation are analyzed and compared for 30-year operation,on the background of the oil-pipeline construction in Northeast China.It is found that the soil above the pipe would be able to achieve thermal balance condition,and the thawing velocity of frozen soils reaches peak value at the first year,then it begins to decrease in the following 4 years,getting to stable condition after the fifth year,the thawing cylinders of the soil around pipelines would be expanding alternately between cold and warm seasons and the thawing depth below the pipe could exceed 10 meters after 30-year operation when the oil temperature is keeping at 15 ℃.However,the thawing depth would be able to maintain between 3.08 m and 3.88 m,when pipeline employed the insulation with thickness of 5~8 cm.Therefore,the insulation would be able to prevent thawing settlement and environmental damage of permafrost effectively.
【Fund】: 国家自然科学基金项目(40401010);; 中国科学院知识创新工程重要方向项目(KZCX2-YW-311);; 中国科学院百人计划项目“气候变化条件下高温冻土区线性工程基础稳定性研究”资助
【CateGory Index】: TE973
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