紧邻多孔交叠盾构隧道施工影响分析

›› 2011, Vol. 32 ›› Issue (S1): 761-0765.

紧邻多孔交叠盾构隧道施工影响分析

李朋¹，徐海清²，李振伟³

1. 武汉理工大学土木工程与建筑学院，武汉 430070；2. 武汉地铁集团有限公司，武汉 430030；3. 北京城建设计研究总院有限公司，北京 100037

收稿日期:2010-11-15 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:李朋，男，1985年生，硕士研究生，主要从事盾构隧道设计方面的研究
基金资助:
武汉地铁集团2010年科技攻关项目

Analysis on construction influence of four adjacent and overlapped shield tunnels

LI Peng¹, XU Hai-qing², LI Zhen-wei³

1. Wuhan University of Technology; Wuhan 430070, China; 2. Wuhan Metro Group Co. Ltd., Wuhan 430030, China; 3. Beijing Urban Engineering Design & Research Institute Co. Ltd., Beijing 100037, China

Received:2010-11-15 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 紧邻多孔交叠隧道是随着地铁建设的不断深入发展而出现的一种复杂的隧道空间分布形式。依托武汉地铁2号线和4号线工程，针对4孔紧邻交叠隧道，采用三维有限元方法分析了隧道动态施工过程引起的地表变形规律以及后建隧道对已建隧道受力与变形的影响。计算结果表明：隧道埋深对地表变形影响显著；紧邻4孔交叠隧道施工引起的地表最终变形达到了32 mm，超出了规范的限值；隧道埋深越大，引起的地表变形越小，但影响的范围越大；紧邻4孔交叠隧道施工时的影响范围为：前方约为30 m、后方约25 m、单侧约30 m；隧道的变形主要表现为上下压扁，两拱腰外扩，变成倒鸭蛋形；隧道的变形主要发生在盾构机刀盘通过前后约1D的范围内，随后很快趋于稳定；隧道结构的沉降主要取决于隧道自身以及其上部的垂直隧道的施工，邻近隧道的施工主要影响已建隧道的侧向变形；后建隧道将少量增加已建隧道管片内的内力。研究成果可为武汉地铁建设以及国内今后类似工程的设计与施工提供参考和指导

关键词: 紧邻多孔交叠隧道, 施工, 地表变形

Abstract: Adjacent overlap multi tunnels are a complex spatial distribution form with the unceasing development of the metro construction. Relying on the project of Wuhan metro line 2 and line 4, for four adjacent and overlapped shield tunnels, 3D FEM is applied to analyzed the ground deformation law caused by dynamic construction of tunnel and the influence of latter tunnel excavation on former tunnel. The results show that the buried depth has a remarkable effect on the ground deformation; the final deformation caused by the construction is 32 mm, which beyonds the standard limits; the larger the buried depth is, the smaller the ground deformation is, but the larger the influence range is; for the ground deformation, the influence range to the ahead is 30 metres, to the back is 25 metres, and the influence range to the transverse for each side is 30 metres; for the tunnel deformation, the top and the bottom are compressed, the left and the right are outward-spread, so the tunnel changes into a inverted duck egg; the tunnel deformation occurs mainly near the cutter of the shield machine, whose range is around 1D, and it becomes steady quickly; the tunnel settlement mainly depends on the construction of the tunnel itself and the vertical tunnel, the construction of adjacent tunnel has major effect on the lateral displacement; the latter tunnel excavation has a great influence on the force of the former tunnel. The research results can provide some references and guidance for Wuhan metro and similar projects in the future.

Key words: Adjacent overlap multi-tunnels, construction, surface deformation

中图分类号:

TU 921

李朋，徐海清，李振伟. 紧邻多孔交叠盾构隧道施工影响分析[J]. , 2011, 32(S1): 761-0765.

LI Peng , XU Hai-qing , LI Zhen-wei. Analysis on construction influence of four adjacent and overlapped shield tunnels[J]. , 2011, 32(S1): 761-0765.

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