土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (4): 685-690.

• 专题论述 • 上一篇    下一篇

无中导连拱隧道施工引起围岩与结构响应分析

苏文煊1，陈焕美2，毕钛俊3   

  1. （1.中坚隧道工程（广东）有限公司，广州 510000；2.云南交发咨询有限公司，昆明 650000； 3.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071）
  • 收稿日期:2024-03-14 修回日期:2024-03-19 出版日期:2024-08-31 发布日期:2024-09-17
  • 作者简介:苏文煊（1977-），男，工程师，研究方向为公路工程。
  • 基金资助:
    云南省交通厅科技项目(云交科教［2019］79号)

Analysis of Surrounding Rock Mass and Structural Response Induced by the Multi-Arch Tunnel without Central Guide Tunnel

SU Wenxuan1, CHEN Huanmei2， BI Taijun3   

  1. (1.Zhongjian Tunnel Engineering (Guangdong) Co. Ltd., Guangzhou 510000；
    2.Yunnan Transportation Development Investment Co. Ltd., Kunming 650000；
    3.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2024-03-14 Revised:2024-03-19 Online:2024-08-31 Published:2024-09-17

摘要： 无中导连拱隧道由于其独特的结构形式，在公路隧道建设中具有较强的适用性。以云南某连拱隧道为依托，采用三维数值模拟方法研究了后行洞施工对先行洞围岩和衬砌的影响，选取若干监测点的应力、位移以及塑性区分布作为研究对象，包括先行洞的洞顶、连拱部位及拱底的位移、断面的水平收敛、先行洞支护结构的应力、隧道周围岩体的应力和塑性区分布。通过先行洞开挖前后围岩与衬砌的力学状态进行对比，分析了后行洞开挖对已有先行洞的影响。结果表明：（1）隧道整体竖向位移分布具有非对称性，后行洞开挖加大了先行洞拱顶的沉降，后行洞开挖造成的先行洞拱顶沉降占先行洞总体沉降的15.6%左右；（2）后行洞开挖对先行洞支护结构应力分布造成显著影响：（3）后行洞施工完成后，先行洞监测断面支护结构最大主应力较先行洞施工完成后提高了大约1.4倍；隧道开挖结束，拉应力区主要集中在先行洞靠近后行洞的拱角处。研究结果可为隧道设计与施工提供参考。

关键词: 连拱隧道, 无中导洞, 三维分析, 施工过程

Abstract: Due to its unique structure, the non-central guide tunnel has a wide applicability in the highway tunnel construction. Based on the construction of the double arch tunnels in Yunnan, this paper uses the three-dimensional numerical simulation to study the impact response of the rear tunnel construction on the surrounding rock mass and the lining of the first tunnel. The stress, displacement, and the plastic zone distribution of several monitoring points are selected as the research objects, including the displacement of the top, double arch position, and arch bottom of the first tunnel, the horizontal convergence of the cross-section, stress of the support structure of the first tunnel, and stress and plastic zone distribution of the surrounding rock mass of the tunnel. The focus is on analyzing the settlement of the arch crown, horizontal convergence of the arch waist, and stress state of the surrounding rock mass and lining during the excavation process of the rear tunnel under the different excavation depths. By comparing the mechanical state of the surrounding rock mass and lining before and after the excavation of the front tunnel, the impact of the rear tunnel excavation on the existing front tunnel is explained and analyzed. The results shown that: (1) the overall vertical displacement distribution of the tunnel is asymmetric, and the excavation of the rear tunnel increases the settlement of the arch top of the front tunnel. The settlement of the arch top of the front tunnel caused by the excavation of the rear tunnel accounts for about 15% of the overall settlement of the front tunnel; (2) The excavation of the rear tunnel has a significant impact on the stress distribution of the support structure of the front tunnel: (3) After the construction of the rear tunnel is completed, the maximum principal stress of the monitoring section support structure of the front tunnel is increased by about 1.4 times compared to the construction of the front tunnel. After the tunnel excavation is completed, the tensile stress zone is mainly concentrated at the arch corner of the leading tunnel near the following tunnel.

Key words: Continuous Arch Tunnel, No Central Guide Tunnel, 3D Analysis, Construction Process

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