中俄原油管道沿线冻土区地基土的导热性及冻害防治  

Thermal conductivity of foundation soil in permafrost area along China-Russia Crude Oil Pipeline and frost damage prevention and control

作　　者：魏斌[1] 王伟 吕岩[3] WEI Bin;WANG Wei;LYU Yan(School of Road and Bridge Engineering,Jilin Communications Polytechnic;School of Civil Engineering,ChangchunInstitute of Technology;College of Construction Engineering,Jilin University)

机构地区：[1]吉林交通职业技术学院道桥工程学院 [2]长春工程学院土木工程学院 [3]吉林大学建设工程学院

出　　处：《油气储运》2022年第1期99-106,共8页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金资助项目“季冻区沼泽草炭土冻胀机理研究”,41502272;吉林省教育厅“十三·五”科研规划项目“基坑水平冻胀力分布规律研究”,JJKH20191243K;长春工程学院主题基金资助项目“冻土区油气管道管土相互作用机制研究”,320200054。

摘　　要：中俄原油管道穿越多年冻土带,由于管沟土的导热性差异,导致管道沿线冻土融沉变形问题严重。选取中俄原油管道沿线砾砂、粉土、粉质黏土、黏土及泥炭质土5种典型地基土进行导热系数测试,以掌握导热系数随影响因素的变化规律。测定5种地基土的导热系数,分析导热系数与含水率、干密度之间的关系,并建立回归方程;根据不同土质条件,分析导热系数随含泥量、塑性指数、烧失量的变化规律;采用灰色关联分析模型计算各影响因素与每种地基土导热系数的关联度。结果表明:5种地基土的导热系数随含水率、干密度的变化而变化;土质条件对导热系数的影响非常大;不同因素对导热性质的影响程度不同。提出了针对不同类型地基土的冻害防治措施,以便为多年冻土区在役或拟建油气管道的冻害防治提供参考。(图6,表4,参22)For China-Russia Crude Oil Pipeline passes through the permafrost area, serious pipeline deformation is resulted from the thaw settlement of frozen soil along the line due to the different thermal conductivity of the trench soil. Herein, the thermal conductivity of five typical foundation soils(gravelly sand, silt, silty clay, clay and peaty soil) along the pipeline was tested to master the variation laws of thermal conductivity with influencing factors. Definitely, the thermal conductivity of the 5 types of foundation soil was determined, the relationship of thermal conductivity with water content and dry density was analyzed, and thereby the regression equations were established. Then, the variation laws of thermal conductivity with mud content, plasticity index and loss on ignition were analyzed according to different soil conditions. In addition, the correlation degree of each influencing factor to the thermal conductivity of each type of foundation soil was calculated with the grey correlation analysis model. The results indicate that: the thermal conductivity of the 5 types of foundation soil varies with the change of water content and dry density, and the thermal conductivity of soils is very greatly affected by the soil conditions,but it is differently influenced by each factor. Hence, different prevention and control measures against frost damage were proposed for different types of foundation soil, so that reference could be provided to the frost damage prevention and control of the oil and gas pipelines in service or to be constructed in the permafrost area.(6 Figures, 4 Tables, 22 References)

关 键 词：原油管道 多年冻土区 导热系数 影响因素 冻害防治 

分 类 号：TU445[建筑科学—岩土工程] TE832[建筑科学—土工工程]