摘要
采空区地表塌陷会引起输电杆塔基础发生滑动、沉降等变形,严重时甚至会造成杆塔倒塌破坏。为研究采空塌陷区输电杆塔的破坏规律,分析了某500 kV线路在不同基础变形条件下的杆塔倾斜率、基础变形率。研究发现:基础变形率相比杆塔倾斜率能够更好地判断采空区输电杆塔的状态;杆塔的基础变形率限值在不均匀沉降下为0.5%,水平相对变形下杆塔轻微破坏为1.0%,严重破坏为2.0%。研究结果为采空区输电杆塔抗基础变形的承载力设计及杆塔安全状态监测与评估提供了重要参考。
Goaf subsidence will cause such deformations as sliding and settlement of the transmission tower foundations,and even cause tower collapse in serious cases.This paper analyzes the tower inclination and foundation deformation rate of a 500 kV line under different foundation deformation conditions in order to study the deformation and failure characteristics of transmission towers in goaf subsidence area.The results show that compared with the tower inclination,the foundation deformation rate can better indicate the status of transmission towers in goaf area;the threshold of the tower foundation deformation rate is 0.5%under the uneven settlement condition,and 1.0%and 2.0%for slight tower damage and serious tower damage respectively under the relative horizontal deformation.The research results of this paper can provide an important reference for the bearing capacity design and the monitoring and evaluation of the tower safety status in the goaf area.
作者
于虹
李昊
康彪
汪大海
张志强
张贵峰
张海鹏
YU Hong;LI Hao;KANG Biao;WANG Dahai;ZHANG Zhiqiang;ZHANG Guifeng;ZHANG Haipeng(Electric Power Research Institute,Yunnan Power Grid Co.,Ltd.,Kunming 650214,China;Department of Building Engineering,Wuhan University of Technology,Wuhan 430070,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou 510663,China)
出处
《中国电力》
CSCD
北大核心
2022年第12期124-134,共11页
Electric Power
基金
国家自然基金资助项目(51878527)
云南电网有限公司科技项目(YNKJXM20210181)。
关键词
采空塌陷区
基础不均匀沉降
基础根开变化
杆塔倾斜率
规范对比
基础变形率限值
goaf subsidence area
foundation uneven settlement
base width change
tower inclination
normative comparison
foundation deformation rate threshold
