Research on the Stability of Thermosyphon Pile Foundations for High-Voltage Transmission Towers Located in Permafrost Regions
XU Xue-yan
YU Lin-lin
WANG Li-yue
Abstract：The displacement of thermosyphon and plain foundation-piles was calculated assum-lng design loading in a permafrost environment.The differences in pile design were compared for completely frozen or completely thawed permafrost.The thermosyphon pile had a horizon-tal displacement of 0.02 mm at the top and a vertical displacement of 0.13 mm when the laver was frozen(spring equinox).When the layers were thawed(autumnal equinox)the corre-sponding displacements were 5.16 mm and 0.31 mm.All these values are smaller than the al-lowed displacement.The maximum load-displacement control ratio is 0.82 or 0.02 for the spring or autumnal equinox.These values are both less than 1.0 so the horizontal toad is ade-quate for design of a transmission-tower foundation.Under the same loading at spring equinox the maximum horizontal displacement of the thermosyphon design is 8%of the plain pile foun-dation.Similarly,the maximum vertical displacement is 62%of the plain design.At autumnal equinox the corresponding displacements are 7.9%and 1.4% of the plain design.The thermo-syphon pile foundation design is clearly more stable than a conventional pile foundation.
Keywords：thermosyphon foundationstabilitynumerical methoddisplacementdesign load
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 20-25 )