大興安嶺林區(qū)桿塔基礎病害特征及防治措施

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中圖分類號：TU445 文獻標識碼：A DOI：10.7525/j.issn.1006-8023.2025.03.021

Abstract：Thefailure of structures or components in permafrost caused by foundation diseases poses a certain threat to the ecologicalsecurityofforestregion.Basedonfieldinvestigationsoffoundationsofpowerfoundationsalong thesection Jagdaqi-Mo'heof Beijing-Mo'he nationalhighwayand China-Russia crude oil pipelines（CRCOPs）nearthe forest region in permafrost in Northeastern China，the maindistresscharacteristicsand countermeasures ofthe foundations wereanalyzed and summarized，and improved countermeasures were proposed.The results from field surveys showed that transmission line towers foundations suffered from frost jacking accounted for 18. 1 % ，including uniform frost jacking （ 8 . 5 % ）and nonuniform frost jacking （ 9 . 6 % ），while foundations with thaw settlement occupied only 3 . 7 % .Fissures （ 2 . 7 % ） spalling （ 2 . 7 % ） ，cracks （ 4 . 3 % ），erosion （ 5 . 9 % ），tilt （ 3 . 7 % ） ），and fracture （ 0 . 5 % ） occurred on the concrete foundation surface.The influences of nonuniform frost jackingand tilting had great influenceonthe safetyofthe tower.The concrete protective caps were more severely damaged by frost action，exhibiting fissures （ 1 5 . 4 % ），spalling （ 8 . 5 % ） cracks （ 1 5 . 4 % ），and erosion（ 5 8 % ）.Similarly，the tilting and collapse of utility poles were primarily caused by frost jacking and crack.Basedon the abovedamages，itissuggested to buildlong-term monitoring systems for tracking the structure in permafrost regions，improveandoptimizetheexisting mitigative measures.Thefindings providesomereferences forthedesign，construction，and damage preventionofinfrastructures inpermafrostregions，aiming tomitigatethe impact of engineering on the ecological environment of natural forest region.

KeyWords：Da Xing'anling；forest region；permafrost regions；poleand tower;transmission line;foundations；distress investigation;mitigative measures

0 引言

我國多年凍土主要分布在青藏高原、西北高山與東北高緯度區(qū)域，占國土陸地面積的 。（剩余14325字）