理论与试验研究

深埋隧道原位扩建围岩松动圈演变规律分析

  • 赖勇 ,
  • 张帅 ,
  • 周锐
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  • 1.重庆交通大学 河海学院,重庆 400074;
    2.中铁二十三局集团有限公司,成都 610072;
    3.西南石油大学 化学化工学院,成都 637001
赖勇(1967—),男,新疆石河子人,博士,教授,主要从事岩土工程、地下工程等领域的教学与科研工作。E-mail:467943565@qq.com
张帅(1992—),男,济南人,博士,工程师,主要从事地下工程施工及管理等领域的研究工作。E-mail:zhangshuai.23g@crcc.cn

收稿日期: 2025-10-16

  网络出版日期: 2026-09-07

基金资助

中铁二十三局集团有限公司科研计划项目(2025-B05)

Analysis of the Evolution Law of Surrounding Rock Loose Ring in Deep-Buried Tunnel In-situ Expansion

  • Lai Yong ,
  • Zhang Shuai ,
  • Zhou Rui
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  • 1. School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, P.R. China;
    2. China Railway 23rd Bureau Group Co., Limited., Chengdu 610072, P.R. China;
    3. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 637001, P.R. China

Received date: 2025-10-16

  Online published: 2026-09-07

摘要

随着城市交通量的不断增加,越来越多的既有隧道改扩建工程被提上日程,开展既有隧道改扩建方面的理论研究对此类工程建设具有重要意义。将既有隧道和扩建隧道简化为等代圆后,借助Mogi-Coulomb强度理论对既有隧道和扩建隧道开展松动圈演变理论研究,基于有限差分软件FLAC3D实现了Mogi-Coulomb理论的二次开发,借助工程实例验证了理论计算结果和数值模拟结果,并分析了相关影响因素,结果表明:(1)深埋隧道改扩建过程中须考虑中间主应力σ2的影响,σ2既影响围岩位移u和塑性区范围RⅡp/RⅡ、松动区范围R′Ⅱ/RⅡ的发展过程,又影响u、RⅡp/RⅡ、R′Ⅱ/RⅡ的最终结果;(2)隧道埋深越深、扩建隧道断面越大时,扩建隧道围岩最终位移u越大,扩建隧道断面越大时埋深对u的影响越大,另外仅隧道埋深对松动区域范围R′Ⅱ/RⅡ的影响较大;(3)既有隧道断面大小和既有支护结构强度对扩建隧道围岩的影响主要集中在掌子面前方的超前位移,当既有隧道断面越小、既有支护结构承载力越小时,扩建隧道围岩的超前变形量越大,施工过程中需重视掌子面前方超前位移的影响。

本文引用格式

赖勇 , 张帅 , 周锐 . 深埋隧道原位扩建围岩松动圈演变规律分析[J]. 地下空间与工程学报, 2026 , 22(4) : 1170 -1178 . DOI: 10.20174/j.JUSE.2026.04.06

Abstract

With the continuous increase in urban traffic, more and more existing tunnel reconstruction and expansion projects have been put on the agenda. It is of great significance to carry out theoretical research on the reconstruction and expansion of existing tunnels. After simplifying the existing tunnel and the tunnel to be expanded as equivalent circles, the evolution theory of the loose zones of the existing tunnel and the tunnel to be expanded is studied using the Mogi-Coulomb strength criterion. The secondary development of the Mogi-Coulomb criterion is realized based on the finite difference software FLAC3D. After verifying the theoretical calculation results and numerical simulation results through engineering examples, the relevant influencing factors are analyzed, and the following conclusions are drawn: (1) The influence of intermediate principal stress σ2 must be considered during the reconstruction and expansion of deep-buried tunnels. σ2 not only affects the development process of surrounding rock displacement u and plastic zone RⅡp/RⅡ and loose zone R′Ⅱ/RⅡ, but also affects the final results of u, RⅡp/RⅡ and R′Ⅱ/RⅡ; (2) When the tunnel is buried deeper and the cross-section of the expanded tunnel is larger, the final deformation u of the surrounding rock of the expanded tunnel is greater. When the cross-section of the expanded tunnel is larger, the influence of the tunnel burial depth on u is greater. Only the tunnel burial depth has a greater influence on the range R′Ⅱ /RⅡ of the loose area. (3) The influence of the size of the existing tunnel section and the strength of the existing supporting structure on the surrounding rock of the expanded tunnel is mainly concentrated on the advance deformation in front of the tunnel face. The smaller the existing tunnel section and the smaller the bearing capacity of the existing supporting structure, the greater the advance deformation. During the construction process, the influence of the advance deformation in front of the tunnel face should be given due attention.

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