上拔荷载作用下装配式输电线路岩石群锚基础受力特性研究
Investigation on Mechanical Behavior of Rock Group Anchor Foundation of Assembled Transmission Line Subjected to Uplift Load
王瑞成 1张琦 1聂少锋 2张斌 1张清政 3王志丰3
作者信息
- 1. 中国能源建设集团 山西省电力勘测设计院有限公司,山西 太原 030001
- 2. 长安大学 建筑工程学院,陕西 西安 710061
- 3. 长安大学 公路学院,陕西 西安 710061
- 折叠
摘要
为解决传统岩石群锚基础材料耗量大、运输不便的问题,提出一种新型装配式输电线路岩石群锚基础.采用有限元方法建立新型群锚基础的三维精细化数值模型,研究上拔荷载作用下群锚基础受力特性,分析锚杆间距、长度及直径等参数对新型群锚基础锚杆内力的影响规律.结果表明:锚杆内力在钢骨架连接处最大,随深度增加逐渐减小;锚杆距群锚基础形心越远,其内力越大;锚筋长度相同时,随着锚杆间距的增大,锚杆内力呈逐渐变小的趋势,而锚筋长度及直径对内力的变化影响较小.将数值计算结果与规范计算结果进行对比发现:处于与水平荷载方向相反且与群锚中心相距最远的两根锚杆的规范计算结果与数值计算结果吻合度高,其余锚杆两种计算结果的吻合度相对较低.
Abstract
In order to solve the problems of large material consumption and inconvenient transportation of traditional rock group anchor foundation,a novel assembled rock group anchor foundation for transmission lines is proposed.The novel foun-dation has the advantages of high assemble degree,short of construction period,and saving the amount of construction mate-rial.The cross-shaped assembled steel structure was used to replace the traditional concrete cap in the novel foundation.The 3D fine numerical model of the novel type of group anchor foundation is established by the finite element method.The me-chanical behavior of the group anchor foundation and the anchor rod subjected to uplift load are analyzed.The influences of the parameters including spacing,length and diameter of the anchor rod on the mechanical behavior of the novel group an-chor foundation are investigated.The results show that the maximum internal force of the anchor rod is at the connection of the steel beam,and the tensile force of the anchor rod decreases with increasing of depth gradually.The farther the anchor rod is from the centroid of the group anchor foundation,the greater the calculated internal force.For the same value of the length of the anchor bars,with the increase of the spacing between the anchor bars,the internal force of the anchor bars gradually decreases,while the length and diameter of the anchor bars have little impact on the changes in internal force.Comparing the numerical results with the calculated results obtained by the theoretical formula in the standard,it is shown that the calculated results of the two anchor rods located in the location farthest from the center of the group anchor have a good fitting effect with the numerical results,while the numerical results of the other anchor rods are relatively small.
关键词
输电线路/群锚基础/上拔荷载/锚杆内力/数值分析Key words
transmission lines/group anchor foundation/lifting load/internal force of bolt/numerical contrast引用本文复制引用
基金项目
中国能源建设集团山西省电力勘测设计院有限公司科技项目(14-K2022-26-T03)
陕西省重点研发计划(2024GX-YBXM-374)
出版年
2024
NETL
NSTL
维普
万方数据