Problems and countermeasures in construction oftransmission line projects in permafrost regions |
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Authors: | GuoShang Wang QiHao Yu YanHui You Ze Zhang Lei Guo ShiJun Wang Yong Yu |
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Affiliation: | Gansu Electric Power Design Institute, Lanzhou, Gansu 730050, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering ResearchInstitute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering ResearchInstitute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering ResearchInstitute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering ResearchInstitute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Gansu Power Transmission Transformation Company, Lanzhou, Gansu 730050, China;Gansu Electric Power Design Institute, Lanzhou, Gansu 730050, China |
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Abstract: | Construction of power transmission lines is becoming an important part of permafrost engineering in China. This paperreviews the construction status and problems of transmission lines in different countries, as well as corresponding solutionsthat would be of practical significance for sustainable engineering practices. Russia has the longest history of transmissionline construction in permafrost areas, with transmission lines (mainly 220 kV and 500 kV) spanning approximately100,000 km. However, all countries suffer from permafrost-related tower foundation stability problems caused by freezing-thawing hazards such as frost heave and thaw settlement, frost lifting, and harmful cryogenic phenomena. Aspoint-line transmission line constructions, the lines, poles and towers should be reasonably selected and installed with acomprehensive consideration of frozen soil characteristics to effectively reduce the occurrence of freezing-thawing disasters.Reinforced concrete pile foundations are widely used in the permafrost regions, and construction in winter is also auniversal practice. Moreover, facilitating engineering measures like thermosyphons are an effective way to reduce freezing-thawing hazards and to maintain the stability of tower foundations. |
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Keywords: | permafrost transmission line key issues analysis |
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