摘要
为探究边坡变形对输电塔线体系安全性的影响规律,以位于滑坡体上的某输电塔线体系为研究对象,采用有限元数值计算方法,考虑塔线耦合作用、土-结构相互作用(SSI)以及边坡变形程度与方向的影响,建立了输电塔线体系整体有限元模型,探究了塔线体系受力特性对边坡变形的响应规律,提出了可用于评估滑坡区输电线路安全性的2个参数,即铁塔塔腿支座位移以及塔腿根开变化值。结果表明:在典型边坡变形作用下,上部塔线体系的失效以第一横隔面以及导线悬挂点附近主材、交叉斜材等杆件的屈服为标志;边坡变形角度对塔线体系失效特征的影响不大,但对其抗边坡变形能力的影响显著;总体来看,塔线体系承受一定倾角边坡变形的能力远小于承受水平地表变形的能力,其中大部分情况下只能承受水平地表变形工况下塔腿支座变形的70%~80%,拉伸变形工况下只能承受水平地表变形工况下塔腿支座变形的60%左右。研究结果对滑坡区输电铁塔的安全防治有指导意义。
In order to explore the influence of slope deformation on the safety of transmission tower-line system,taking the tower-line system of UHV transmission line located on the landslide as the research object,bases on the finite element numerical calculation method,with consideration of the influence of tower-line coupling,the soil-structure interaction(SSI),and the degree and direction of slope deformation,this paper established a overall finite element model for transmission tower-line system,and explored the response law of the stress characteristics of the tower-line system to slope deformation,and put forward two monitoring parameters that can be used to evaluate the safety of transmission lines in landslide areas,namely the displacement of tower leg support and the change value of tower leg root opening.The results show that under typical slope deformation,the failure of the upper tower-line system is marked by the yield of the first cross-partition,the principal and crossdiagonal members near the suspension point of the conductor.The angle of slope deformation has little effect on the failure characteristics of the tower line system,but has a significant impact on its ability to resist slope deformation;overall,the capacity of the tower system to bear slope deformation with a certain inclination angle is far less than that of horizontal surface deformation,most of which can only bear 70%~80%of the deformation of tower leg support under horizontal surface deformation and only bear about 60%of the deformation of tower leg support under horizontal surface deformation under tensile condition,which can provide guidance for the safety prevention and control of transmission towers in landslide areas.
作者
陈树平
李成
王彦海
苗红璞
李双林
周冬阳
CHEN Shuping;LI Cheng;WANG Yanhai;MIAO Hongpu;LI Shuanglin;ZHOU Dongyang(China Southern Power Grid Extra High Voltage Power Transmission Company Wuzhou Branch,Wuzhou 543002,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line,China Three Gorges University,Yichang 443002,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2024年第5期135-145,共11页
Safety and Environmental Engineering
基金
南方电网公司科技项目(010500KK52210002)
国家自然科学基金项目(52079070)。
关键词
滑坡区
安全性分析
塔线体系
土-结构相互作用(SSI)
抗边坡变形能力
有限元数值计算方法
landslide area
safety analysis
tower-line system
soil-structure interaction(SSI)
resistance to slope deformation
finite element numerical calculation method
