土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (4): 404-411.

• 工程实录 • 上一篇    下一篇

双连拱隧道无导洞法施工断面对隧道稳定性影响

赵剑雄1,2，刘军旗2，张冬妍3，袁柳峰4，林孔斌4   

  1. （1.广州地铁集团有限公司，广州 511430；2.中国地质大学（武汉） 教育部长江三峡库区地质灾害研究中心，武汉 430074；
    3.中国地质大学（武汉） 公共管理学院，武汉 430074；4.福建省交通规划设计院，福州 350004）
  • 收稿日期:2019-09-04 修回日期:2019-09-27 出版日期:2020-08-20 发布日期:2020-08-15
  • 作者简介:赵剑雄（1992-），男，硕士，助理工程师，研究方向为研究方向为岩土工程三维建模与数值模拟。

Stability in the Construction of a Double-Arched Tunnel without Pilot Tunnel Excavated

ZHAO Jianxiong1,2, LIU Junqi2, ZHANG Dongyan3, YUAN Liufeng4, LIN Kongbin4   

  1. (1.Guangzhou Metro Group Co.,Ltd., Guangzhou 511430；2.Three Gorges Research Center for Geohazards, Ministry of Education, China University of Geosciences, Wuhan 430074；3.School of Public Administration, China University of Geosciences,Wuhan 430074；4.Fujian Communications Planning & Design Institute, Fuzhou 350004)
  • Received:2019-09-04 Revised:2019-09-27 Online:2020-08-20 Published:2020-08-15

摘要： 为了对比分析采用无导洞法施工连拱隧道时最安全稳定的开挖断面形式，提高施工过程中衬砌结构的安全性和稳定性，以福建某连拱隧道作为工程背景，按照中墙顶部回填量从大到小的顺序选取了三种不同的施工断面方案，应用数值模拟方法，研究了最终状态衬砌结构安全系数、临时支撑和中墙稳定性三个方面，对三种方案稳隧道结构的稳定性及其变化规律进行了详细对比分析，发现后行洞上台阶开挖与支护的过程是衬砌结构受力变化最大的过程；无论哪种方案，在浇筑中墙后立刻回填中墙顶部的空隙总是对衬砌结构有利。可见，选择方案三作为无导洞法施工连拱隧道的断面形式，并及时回填中墙顶部，可以有效提高连拱隧道结构的安全性与稳定性，是最优的断面形式。


关键词: 隧道工程, 无导洞法施工方案, 数值模拟, 双连拱隧道, 安全系数

Abstract: In order to compare and evaluate the most safe and stable cross section type in the excavation of the multi-arch tunnel without a pilot tunnel excavated first as well as to improve the safety and stability of the tunnel lining structure during the tunnel excavation, this paper presents a case history of the excavation and evaluation results of a multi-arched tunnel in Fujian Province. Three different tunnel excavation sequences with the amount of backfill at the top of mid-wall area were numerically evaluated for the factors of safety for the lining structure at final stage, temporary supporting structures and midwall stability. The stability of the tunnel structures and its variation during three different tunnel excavation sequences at various stage of excavation are compared in detail. The results indicate that that the maximum stress changes are found in the lining structure at upper step of the later excavated tunnel. In all three excavation sequences, the immediate filling the gap between the lining structure and the mid-wall is beneficial to the stability of the lining structure. It is also concluded that the method three can be used as the crosssection type of the tunnel excavation without a pilot tunnel excavated. The stability of the lining structure in the multiarched tunnel excavation can be improved by the immediate backfilling of the top of mid-wall.

Key words: Tunnel Engineering, Tunnel Excavation without Pilot Tunnel Excavated, Numerical Simulations, Multiarch Tunnel, Factor of Safety

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