Centrifuge model test on performance of thermosyphon cooled sandbags stabilizing warm oil pipeline buried in permafrost  

作　　者：GuoYu Li HongYuan Jing Nikolay Volkov Wei Ma PengChao Chen 

机构地区：[1]State Key Laboratory of Frozen Soil Engineering(SKLFSE),Northwest Institute of Eco-Environment and Resources(NIEER),Chinese Academy of Sciences(CAS),Lanzhou,Gansu 730000,China [2]Da Xing'anling Observation and Research Station of Frozen-ground Engineering and Environment,NIEER,CAS,Jiagedaqi,Heilongjiang 165000,China [3]PipeChina North Pipeline Company,Langfang,Hebei 065000,China [4]GEOINGSERVICE LLP(Fugro Group),29 Vernadskogo Avenue,Moscow,Russia

出　　处：《Research in Cold and Arid Regions》2021年第3期234-255,共22页寒旱区科学（英文版）

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences (XDA20030201);National Natural Science Foundation of China (41672310);the National Key Research and Development Program (Nos. 2017YFC0405101 and 2016YFC0802103);the Research Project of the State Key Laboratory of Frozen Soil Engineering (SKLFSE-ZY-20)。

摘　　要：The thaw settlement of pipeline foundation soils in response to the operation of the first China-Russia Crude Oil Pipeline along the eastern flank of the northern Da Xing'anling Mountains in Northeast China was simulated in a physical model test(with a similitude ratio of 1/73) in a geotechnical centrifuge. Two pipes of a supported and an unsupported section were evaluated over a testing period for simulating 20 years of actual pipeline operation with seasonal cyclically changing oil and ambient temperatures. The results show that pipe settlement of the supported pipe was 45% of settlement of the unsupported pipe. Settlement for the unsupported section was approximately 35% of the thaw bulb depth below the initial pipe elevation, only 30% of that for the supported pipe due to the influence of the supports. The final thaw bulbs extended approximately 3.6 and 1.6 times of the pipe diameter below the unsupported and supported pipe bottom elevations, respectively. The sandbag supports kept frozen during the test period because of cooling effect of the thermosyphons. The maximum bending stress induced over the 20 m span length from bearing of the full cover over the pipe would be equivalent to40% specified minimum yield strength(SMYS). Potential buckling of the pipe should be considered as the ground thaws.This study also offers important data for calibration and validation of numerical simulation models.

关 键 词：centrifuge test oil pipeline frost heave THERMOSYPHON thaw settlement permafrost engineering 

分 类 号：P642.14[天文地球—工程地质学] TE973[天文地球—地质矿产勘探]