土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (6): 737-740.

• 专题论述 • 上一篇    下一篇

盾构隧道下穿高速公路桥梁安全风险研究

殷 建   

  1. （苏州市轨道交通集团有限公司，江苏苏州 215008）
  • 收稿日期:2021-04-08 修回日期:2021-04-16 出版日期:2021-12-30 发布日期:2021-12-24
  • 作者简介:殷建（1987-），男，工程师，研究方向为地铁设计与管理。
  • 基金资助:
    上海市自然科学基金资助项目(19ZR1460400)

Safety Hazards of the Shielded Tunnel Excavation Under Passing an Expressway Bridge

YIN Jian   

  1. (Suzhou Rail Trans Group Co. Ltd., Suzhou 215008)
  • Received:2021-04-08 Revised:2021-04-16 Online:2021-12-30 Published:2021-12-24

摘要： 以下穿常台高速公路的苏州轨道交通6号线徐家浜站~中新大道西站区间盾构隧道工程为依托，基于盾构隧道与高速公路桥梁的相对位置关系和轨道交通结构的特点，对盾构隧道下穿高速公路的安全风险进行理论评估，并建立三维仿真模型，模拟分析盾构掘进施工过程中高速公路桥墩的受力变形。结果表明，盾构下穿施工期间，桥墩位移和变形以顺桥向为主，顺桥向最大水平位移为3.3 mm，最大差异沉降为0.39 mm;盾构隧道采用分区控制，控制同步注浆量的施工方式对高速公路桥墩的影响均在规范控制范围内，盾构穿越高速公路进行施工影响区划分，按照分区进行控制，可有效减少高架桥桩变形和位移，保证高速公路的运营安全。

关键词: 盾构隧道, 高速公路, 高架桥梁, 数值仿真, 安全风险

Abstract: This paper presents a case history of safety hazards evaluation of the shielded tunnel excavation under pass the existing highway bridge in the Suzhou Rail Transit No. 6 Line under passing the Changtai Expressway at location between Xujiabang and West Zhongxin Avenue stations. The influence of the relative location between the shielded tunnel and the expressway bridge on the safety hazards was evaluated by the three-dimensional finite element method and the stress and deformation of bridge piers induced by the tunnel excavation were simulated. The numerical simulation results indicate that, the deformation of the bridge piers is mainly in the traffic (longitudinal) direction with a maximum deflection of 3.3 mm. The maximum differential settlement is 0.39 mm. If the shielded tunnel excavations could use the zoned method and the control of amount of grouting, the bridge pier deformation could be controlled within the tolerable range. 

Key words: shielded tunnel excavation, expressway, bridge viaduct, numerical simulation, safety hazards

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