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隧道建设(中英文) ›› 2015, Vol. 35 ›› Issue (5): 413-418.DOI: 10.3973/j.issn.1672-741X.2015.05.004

• 研究与探索 • 上一篇    下一篇

盾构掘进对邻近桩基的变形特征研究

胡德华, 段景川   

  1. (中电建南方建设投资有限公司, 广东 深圳 518000)
  • 收稿日期:2015-01-15 修回日期:2015-03-25 出版日期:2015-05-20 发布日期:2015-05-22
  • 作者简介:胡德华(1967—),男,河南信阳人,1993年毕业于南京建筑工程学院,测量工程专业,本科,高级工程师,现从事地铁施工管理工作。

Study on Characteristics of Deformation of Adjacent  Pile Foundations Caused by Shield Boring

HU Dehua, DUAN Jingchuan   

  1. (Electric Power Construction South Construction Investment Co. Ltd., Shenzhen 518000, Guangdong, China)
  • Received:2015-01-15 Revised:2015-03-25 Online:2015-05-20 Published:2015-05-22

摘要:

深圳地铁7号线盾构区间在YDK14+180~+280段进行近接桩基施工中,为了严格控制施工对近接桩基的扰动,以保证施工的安全性,通过有限元软件分析了不同掘进姿态在盾构施工过程中对近接桩基的影响。指出: 1)盾构掘进姿态是施工过程中对近接结构物影响十分显著的因素,施工时应加以严格控制; 2)在盾构蛇行推进过程中,随桩基与掌子面距离的减小和盾构蛇行偏角的加大,盾构施工掘进对桩基的影响程度在加大; 3)在盾构刀盘推进至距离桩基间距为2.0D时,应严格控制盾构施工过程中的掘进姿态,特别需要控制盾构的左右偏离。

关键词: 深圳地铁, 盾构掘进姿态, 近接桩, 有限元分析, 变形特征

Abstract:

From YDK14+180 to YDK14+280 of a running tunnel on Line 7 of Shenzhen Metro, the shield bores close to the existing pile foundations of a bridge. In the paper, the influence of different shield attitudes on the pile foundations is analyzed by means of finite element program, so as to bring the disturbance to the pile foundations under effective control and to ensure the tunneling safety. Conclusions drawn are as follows: 1) Shield attitude has great influence on the pile foundations, therefore shield attitude should be well controlled during tunneling; 2) As the distance between the shield and the pile foundations reduces and the shield rolling angle increases, the impact of shield boring on the pile foundations grows; 3) When the distance between the shield cutterhead and the pile foundation is twice the tunnel diameter, the rolling of the shield shall be strictly controlled.

Key words: Shenzhen Metro, shield attitude, pile foundation, finite element analysis, deformation characteristics

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