摘要
由基础病害造成的多年冻土区结构或构件失效将对林区生态安全构成一定威胁,为此通过对东北多年冻土区京漠线及中俄原油管道沿线附近林区的杆塔基础进行实地调查,分析总结其主要病害特征及现有防治措施并提出改进建议。调查结果表明,出现冻拔病害的输电线铁塔基础占18.1%,包括均匀冻拔(8.5%)和不均匀冻拔(9.6%),而出现融沉病害的基础仅占3.7%;混凝土基础表面出现裂缝(2.7%)、剥落(2.7%)、裂纹(4.3%)、侵蚀(5.9%)、倾斜(3.7%)和压裂(0.5%)等病害;基础不均匀冻拔与倾斜对铁塔安全影响较大;混凝土保护帽冻害严重,主要表现为裂缝(15.4%)、剥落(8.5%)、裂纹(15.4%)和侵蚀(58%);冻拔和冻裂也是造成线杆倾斜和断裂倒塌的主要原因。针对以上基础病害问题,建议对冻土区域内的工程结构进行长期跟踪监测并完善改进现有处置措施。调查结果可为多年冻土区基础设施的设计、建造及病害防治策略提供重要的参考和借鉴,以期减弱工程对自然林区生态环境的影响。
The failure of structures or components in permafrost caused by foundation diseases poses a certain threat to the ecological security of forest region.Based on field investigations of foundations of power foundations along the section Jagdaqi-Mo´he of Beijing-Mo´he national highway and China-Russia crude oil pipelines(CRCOPs)near the forest region in permafrost in Northeastern China,the main distress characteristics and countermeasures of the foundations were ana⁃lyzed and summarized,and improved countermeasures were proposed.The results from field surveys showed that trans⁃mission 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 foun⁃dation surface.The influences of nonuniform frost jacking and tilting had great influence on the safety of the tower.The concrete protective caps were more severely damaged by frost action,exhibiting fissures(15.4%),spalling(8.5%),cracks(15.4%),and erosion(58%).Similarly,the tilting and collapse of utility poles were primarily caused by frost jacking and crack.Based on the above damages,it is suggested to build long-term monitoring systems for tracking the structures in permafrost regions,improve and optimize the existing mitigative measures.The findings provide some refer⁃ences for the design,construction,and damage prevention of infrastructures in permafrost regions,aiming to mitigate the impact of engineering on the ecological environment of natural forest region.
作者
林峻岑
张航
李国玉
苏安双
高凯
曹亚鹏
陈敦
王旭
王淼
LIN Juncen;ZHANG Hang;LI Guoyu;SU Anshuang;GAO Kai;CAO Yapeng;CHEN Dun;WANG Xu;WANG Miao(State Key Laboratory of Frozen Soil Engineering,Northwest Institute of EcoEnvironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Electric Power Research Institute,State Grid Heilongjiang Electric Power Company Limited,Harbin 150030,China;Heilongjiang Province Hydraulic Research Institute,Harbin 150050,China;Da Xing´anling Observation and Research Station of FrozenGround Engineering and Environment,Northwest Institute of EcoEnvironment and Resources,Chinese Academy of Sciences,Jagdaqi Heilongjiang 165000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Heilongjiang Transportation Information and Science Research Center,Harbin 150080,China;International Research Center for ChinaMongoliaRussia Cold and Arid Regions Environment and Engineering,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《森林工程》
北大核心
2025年第3期646-656,共11页
Forest Engineering
基金
国家电网有限公司科技项目(5200-202230098A-1-1-ZN)。
关键词
大兴安岭林区
多年冻土区
基础
病害调查
防治措施
Da Xing´anling
forest region
permafrost regions
pole and tower
transmission line
foundations
distress investigation
mitigative measures
