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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (S1): 79-86.DOI: 10.3973/j.issn.2096-4498.2018.S1.013

• 研究与探索 • 上一篇    下一篇

盾构隧道埋深对临近铁路桥梁的影响分析

阮雷, 蹇蕴奇, 鲁茜茜, 王帆, 王士民   

  1. (西南交通大学交通隧道工程教育部重点实验室, 四川 成都 610031)
  • 收稿日期:2018-01-30 修回日期:2018-05-23 出版日期:2018-06-15 发布日期:2018-06-19
  • 作者简介:阮雷(1989—),男,陕西商洛人,西南交通大学桥梁与隧道工程专业在读硕士,研究方向为隧道与地下工程。Email: coolme7guai@qq.com。
  • 基金资助:

    国家自然科学基金面上项目(51578461); 武汉轨道交通线路穿越既有铁路工程设计关键技术研究及设计指南(GS-JZ-474)

Analysis on Influence of Shield Tunnel Buried Depth on Adjacent Railway Bridges

RUAN Lei, JIAN Yunqi, LU Xixi, WANG Fan, WANG Shimin   

  1. (1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
  • Received:2018-01-30 Revised:2018-05-23 Online:2018-06-15 Published:2018-06-19

摘要:

为研究盾构隧道下穿临近铁路桥梁过程中隧道埋深对既有桥梁沉降变形及水平位移变化的影响,以武汉地铁3号线区间盾构穿越铁路桥梁工程为依托,利用有限元软件ANSYS对不同隧道埋深(2D、2.5D、3D(D为隧道直径))下桥梁的梁体结构、轨道线路及桩基位移等进行对比分析,并结合现场数据进行验证。研究结果表明: 1)随着隧道埋深的增大会引起桩基、梁体及钢轨等结构竖向位移的增大,当隧道埋深为18 m时,墩台最大沉降超过了限制值; 2)隧道埋深分别为12、15、18 m时,桥梁墩台及梁体结构均表现出以沉降为主的变形,而水平位移变化幅度较小; 3)在满足地表沉降限值的条件下可适当减少隧道埋深,以控制隧道开挖引起的上部桥梁、钢轨等结构物变形。

关键词: 盾构隧道, 下穿桥梁, 隧道埋深, 数值模拟, 位移

Abstract:

Taking the construction of the shield tunnel crossing railway bridge of Wuhan Metro Line 3 as an example, the displacement of the beam structure, track line and pile bridges under different burial depths (2D, 2.5D, 3D) are analyzed with the finite element software ANSYS and then being validated with the field data to study the effect of tunnel buried depth on the settlement deformation and horizontal displacement of existing bridges during the process of shield tunnels passing through adjacent railway bridges. The results showed that: (1) Increasing the depth of tunnel will increase the vertical displacement of pile foundation, beam and rail structure, and when the depth of the tunnel is 18 m, the maximum settlement of the pier exceeds the limit value; (2) When the tunnel burial depths are 12 m, 15 m and 18 m, the deformations of piers and beam structures are mainly vertical displacements, while horizontal displacements are smaller; (3) When the surface subsidence limit is met, the deformation of the upper bridges, rails, and other structures caused by the tunnel excavation is controlled by appropriately reducing the tunnel burial depth.

Key words: shield tunnel, passing below bridge, buried depth, numerical simulation, displacement

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