高压输电线路杆塔根键基础承载特性研究  

Study on the Bearing Characteristics of Root Foundation for High Voltage Transmission Line

作　　者：杨森林 马雄 康羽鹤 张君 李涓 陈旭 YANG Senin;MA Xiong;KANG Yuhe;ZHANG Jun;LI Juan;CHEN Xu(Qinghai Power Transmission&Transformation Engineering Co.,Ltd.,Xining 810001,China;State Grid Qinghai Electric Power Company Construction Company,Xining 810001,China;Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]青海送变电工程有限公司,青海西宁810001 [2]国网青海省电力公司建设公司,青海西宁810001 [3]重庆交通大学,重庆400074

出　　处：《电力勘测设计》2024年第12期50-55,共6页Electric Power Survey & Design

基　　金：国网青海电力公司科技项目“适应青藏高原地质条件的抢修塔装配式基础研究与应用”(52283820000A)。

摘　　要：针对高压输电线路杆塔基础承载力不足的问题,埋深较浅的根键基础以其结构特性和经济性被采用,以提升基础承载力性能。在现场足尺试验的基础上,对比分析传统金属式装配基础与单双层根键基础水平荷载作用下的荷载-位移曲线,对水平荷载作用下主筋应力情况及根键弯矩情况进行分析。分析结果表明:根键基础水平承载性能明显优于传统金属装配式基础;双层根键基础的水平承载性能比单层根键基础更高,其受拉侧变形量大于受压侧,符合基础受水平推力作用下产生与施力方向一致的位移规律;双层根键基础的上层根键受水平推力影响小,弯矩变化率小,而下层根键发生的情况则与上层相反。For the problem of insufficient bearing capacity of transmission line’s tower foundation,the root foundation is adopted for its structural and economic advantages,which can greatly improve the bearing capacity of the foundation.In this paper,field tests of the load-displacement curves between single-layer and double-layer root foundations and traditional metal fabricated foundation under the lateral load are compared and analyzed,and the stress of main reinforcement and bending moment of root foundation under lateral load are also analyzed.The results show that the lateral bearing capacity of root foundation is much better than that of traditional metal fabricated foundation.The lateral bearing capacity of double-layer root foundation is better than that of single-layer root foundation.The deformation of the double-layer root foundation at the tension side is greater than that at the compression side,which is in line with the rule that the displacement generated by the foundation under the action of lateral thrust is consistent with the direction of force application.The roots at the upper part of the double-layer foundation are less affected by lateral load,and the change rate of bending moment is small,while the condition of the roots at the lower part of double-layer foundation is opposite.

关 键 词：输电线路 根键基础 承载性能 应力 弯矩 

分 类 号：TM75[电气工程—电力系统及自动化]