土工基础

›› 2019, Vol. 33 ›› Issue (2): 145-150.

• 工程实录 • 上一篇    下一篇

云南永德220 kV高压电塔基础加固技术

陈 鹏1，戴旭明2，刘 伟2，徐 曙1，柯 磊1   

  1. (1.深圳供电局有限公司输电管理所，深圳 518020；2.中国能源建设集团广东省电力设计研究院有限公司，广州 510663)
  • 收稿日期:2019-03-12 修回日期:2019-03-14 出版日期:2019-04-20 发布日期:2019-04-22
  • 通讯作者: 戴旭明(1982-)，男，硕士，高级工程师，研究方向为岩土工程设计、地质灾害防治治理。
  • 作者简介:陈 鹏(1979-)，男，硕士，高级工程师，研究方向为输变电管理。
  • 基金资助:

    基金项目：中国南方电网有限公司科技项目（090000KK52160020）

Foundation Strengthening for a 220 kV High Voltage Power Transmission Tower Foundation  in Yongde, Yunnan Province

CHEN Peng1, DAI Xuming2, LIU Wei2, XU Shu1, KE Lei1   

  1. （1.Shenzhen Power Supply Bureau Co. Ltd., Shenzhen 518020；
    2.Guangdong Electric Power Design and Research Institute Co. Ltd., China Energy Construction Group Co., Guangzhou 510663）
  • Received:2019-03-12 Revised:2019-03-14 Online:2019-04-20 Published:2019-04-22

摘要： 通过对拟建云南永德220 kV输变电工程变电站址的地质状况与地层条件的勘察，对站址的岩土试样进行土工试验，评估其地基承载等级，提出了一种中空注浆锚索及其支护结构的基础加固技术，并进行了现场试验。试验研究表明，组合锚索的整体受力状态稳定，加固后期并没有出现锚索与地层脱离应力变小的情况，支护结构能够有效地对基础进行加固；后期随着时间的推移基坑底部趋于稳定，变形速率减小为零，基坑主要松动区在底部深度6 m范围内，深部位移最大值不足1 mm，底部地层稳定，加固效果十分理想。和常规加固方法相比，该方法能够满足现场施工的高要求，施工过程简单高效，还能极大节省加固成本，对类似工程的地基加固有重要的参考意义。

关键词: 土工试验, 锚索, 注浆, 地基加固

Abstract: The proposed Yunnan Yongde 220kV power transmission project site was geologically and geotechnically investigated. Based on the site conditions, laboratory test results and site bearing capacity class, the transmission tower foundation strengthening program utilized the pressure grouted ground anchors. The test results indicate that the ground anchor was stable after the loading and no strain softening and pullout failure were observed. The pressure grouted ground anchor can effectively strengthen the foundation. At the later stage of the loading, the strain rate was reduced to zero. The deformation zone underneath the foundation was limited to 6 meters below the footing. The maximum deflection at the bottom of the ground anchor is less than one millimeter, indicating a satisfactory result. Compared with the conventional reinforcement method, this method can meet the restrictive requirements of the field construction, the construction process is not only simple and efficient, but also is very cost effective.

Key words: laboratory tests of soil and rock samples, ground anchors, grouting, foundation reinforcement