中国电力 ›› 2022, Vol. 55 ›› Issue (12): 124-134.DOI: 10.11930/j.issn.1004-9649.202209080

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采空塌陷区输电杆塔基础变形率限值研究

于虹1, 李昊1, 康彪2, 汪大海2, 张志强3, 张贵峰3, 张海鹏3   

  1. 1. 云南电网有限责任公司电力科学研究院,云南 昆明 650214;
    2. 武汉理工大学 建筑工程系,湖北 武汉 430070;
    3. 南方电网科学研究院有限责任公司,广东 广州 510663
  • 收稿日期:2022-09-22 修回日期:2022-10-19 发布日期:2022-12-28
  • 作者简介:于虹(1978—),女,博士,高级工程师(教授级),从事输电线路防灾减灾研究,E-mail:yuhong2388245@163.com;张志强(1993—),男,通信作者,研究员,从事输电线路力学研究及电网防灾减灾研究,E-mail:zhangzq4@csg.cn
  • 基金资助:
    国家自然基金资助项目(51878527);云南电网有限公司科技项目(YNKJXM20210181)

Study on the Threshold for Deformation Rate of Transmission Tower Foundation in Goaf Subsidence Area

YU Hong1, LI Hao1, KANG Biao2, WANG Dahai2, ZHANG Zhiqiang3, ZHANG Guifeng3, ZHANG Haipeng3   

  1. 1. Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650214, China;
    2. Department of Building Engineering, Wuhan University of Technology, Wuhan 430070, China;
    3. CSG Electric Power Research Institute Co., Ltd., Guangzhou 510663, China
  • Received:2022-09-22 Revised:2022-10-19 Published:2022-12-28
  • Supported by:
    This work is supported by National Natural Science Foundation of China (No.51878527), Science and Technology Project of Yunnan Power Grid Co., Ltd. (No.YNKJXM20210181)

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。

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

Abstract: 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.

Key words: goaf subsidence area, foundation uneven settlement, base width change, tower inclination, normative comparison, foundation deformation rate threshold