摘要
行业标准《架空输电线路基础设计规程》(DL/T5219—2023,以下简称《规程》)推荐的土重法计算拉线盘基础抗拔极限承载力,未考虑饱和黏土中负孔隙水压力导致拉线盘与下方土体不分离、抗拔贡献增大的情况。本文提出了一种精确计算方法,通过建立土体整体剪切破坏时的竖向、水平及弯矩静力学平衡方程,采用变分法联合求解该方程组,推导出饱和黏土中拉线盘基础的抗拔极限承载力计算公式,并分析黏聚力与内摩擦角对抗拔极限承载力的影响。此外,引入荷载系数N1和N2简化计算流程。研究表明,利用本文所提方法计算的抗拔极限承载力是利用《规程》推荐方法计算结果的3倍以上。通过简化公式和查表法可高效计算抗拔极限承载力。本文方法弥补了《规程》推荐方法的不足,为饱和黏土地质条件下拉线盘基础设计提供了参考。该简化公式和查表法更便于工程应用。
When the soil weight method is used to calculate the ultimate uplift capacity of the guyed disk foundation in the standard Code for Design of Foundation of Overhead Transmission Line(DL/T 5219-2023,here-inafter referred to as the Code),the negative pore water pressure in guyed disk is not considered,which leads to the problem that the soil under the guyed disk is not separated and the uplift contribution increases.Therefore,a more accurate calculation method is proposed.By establishing the vertical,horizontal and bending moment static equilibrium equations of the overall shear failure of the soil,the variational method is introduced to solve the equations,and the calculation formula of the ultimate uplift capacity of the guyed disk foundation in saturated clays is derived,and the influence of cohesion and internal friction angle on ultimate uplift capacity is analyzed.In addition,a simplified look-up table calculation process of load coefficients N1 and N2 is proposed.The results show the results calculated by the formula of ultimate uplift capacity derived in this paper are more than three times that calculatd by using the Code.The ultimate uplift capacity can be obtained efficiently by simplified formula and look-up table method.The method in this paper makes up for the calculation defects of Code,and provides a reference for the design of guyed disk foundation under saturated clay geological conditions.The simplified formula and look-up table method are more convenient for engineering applications.
作者
效志强
陈益剑
张永建
XIAO Zhiqiang;CHEN Yijian;ZHANG Yongjian(Hainan Power Grid Co.,Ltd.,China Southern Power Grid,Haikou 571100,China;Power China Hainan Electric Power Engineering Co.,Ltd.,Haikou 571100,China)
出处
《电力学报》
2025年第3期216-224,共9页
Journal of Electric Power
关键词
输电线路
拉线杆塔
拉线盘基础
抗拔极限承载力
变分法
黏聚力
内摩擦角
滑动面方程
滑动面正应力方程
荷载系数
transmission line
guyed tower
guyed disk foundation
ultimate uplift capacity
variational solution
cohesion
angle of internal friction
equation of sliding surface
equation of normal stress on the sliding surface
load coefficients
