土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (4): 442-446.

• 工程实录 • 上一篇    下一篇

超大直径盾构近接既有高架桥梁桩基础施工风险分析与控制措施

袁  鹏   

  1. (上海市市政工程管理咨询有限公司，上海 200093)
  • 收稿日期:2020-03-28 修回日期:2020-04-02 出版日期:2020-08-20 发布日期:2020-08-15
  • 作者简介:袁 鹏(1964-)，男，高级工程师，研究方向为道路桥梁、超深基坑、大直径盾构隧道等工程的项目管理、工程监理、技术咨询等。

Risk Analysis and Management Measures of Constructing an Extra-Large Diameter Shielded Tunnel Adjacent to an Existing Pile Supported Viaduct

YUAN Peng   

  1. (Shanghai Municipal Engineering Management Consulting Co. Ltd., Shanghai 200093)
  • Received:2020-03-28 Revised:2020-04-02 Online:2020-08-20 Published:2020-08-15

摘要： 超大直径盾构隧道近距离穿越既有建（构）筑物基础施工时存在极大风险，以上海长江路越江隧道为工程背景，对该隧道近距离穿越逸仙路高架和轨道交通3号线高架桩基施工过程中存在的风险进行辨识和分析，采用MJS工法在穿越前对高架桥梁桩基进行隔离加固的措施，在穿越过程中通过试验、监测、调整确定出盾构机推进穿越高架桩基时施工参数的建议值，穿越后对桩基础进行监控，直至变形稳定且满足工后变形标准。工程的成功穿越，可为同类型工程超近距离穿越既有建（构）筑物深层基础提供可借鉴的工程经验。

关键词: 超大直径盾构, 近接施工, 桥梁桩基, 风险分析, 风险控制

Abstract: Huge potential risks exist during the construction of the extralarge diameter shielded tunnels passing through the pile supported foundation of adjacent existing buildings or other structures. This paper presents a shielded tunnel construction of Changjiang Road river crossing tunnel in Shanghai. Tunnel excavation near the pile supported viaduct of Yixian Road and Rail Transit Line #3 induced risks are identified and analyzed. The Metro Jet System (MJS) was used to isolate and to strengthen the pile supported foundations adjacent to areas to be undercrossed. The design and construction parameters for the under passing the pile supported foundations were able to be adjusted by the trail excavation and construction monitoring. The deformation of the isolated foundation structures were monitored during the construction until the deformation is stabilized and meet the allowable post construction deformation criteria.

Key words: Super Large Diameter Shield, Approaching Construction, Pile Supported Bridge Foundations, Risk Analysis, Risk Management

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