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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • 创刊于1988年
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采选技术与矿山管理

超大断面扁平结构隧道施工参数优化研究

  • 刘宽 ,
  • 莫冠旺 ,
  • 李响 ,
  • 沈平欢 ,
  • 万波 ,
  • 刘建坤
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  • 1.上海隧道工程有限公司,上海 200032
    2.中山大学土木工程学院,广东 珠海 519000
刘宽(1976-),男,内蒙古巴盟人,高级工程师,从事隧道工程研究工作。1833458942@qq.com

收稿日期: 2023-12-07

  修回日期: 2024-01-24

  网络出版日期: 2024-05-21

基金资助

上海隧道工程有限公司横向课题“软弱地层超大断面扁平结构矿山法隧道施工关键技术研究”(2022-sk-19)

Optimization of the Construction Parameters of Super-large Section Flat Structure Tunnel

  • Kuan LIU ,
  • Guanwang MO ,
  • Xiang LI ,
  • Pinghuan SHEN ,
  • Bo WAN ,
  • Jiankun LIU
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  • 1.Shanghai Tunnel Engineering Co. , Ltd. , Shanghai 200032, China
    2.School of Civil Engineering, Sun Yat-Sen University, Zhuhai 519000, Guangdong, China

Received date: 2023-12-07

  Revised date: 2024-01-24

  Online published: 2024-05-21

摘要

基于某超大断面扁平结构隧道的上下台阶法施工段,采用数值模拟方法研究在该工程地质条件下台阶长度和锚杆纵距2种施工参数改变带来的影响。利用数值模型对不同台阶长度(分别为30,40,50,60 m)和不同锚杆纵距(分别为1.0,1.5,2.0 m)情况进行研究,对隧洞周边岩体中塑性区、围岩应力和围岩变形情况的分布规律进行分析,结合数值结果和现场监测数据验证了施工现场采用台阶长度为50 m和锚杆纵距为1 m的施工参数较合理。该研究成果可为超大断面扁平结构隧道的开挖和支护施工参数的合理选取提供参考。

本文引用格式

刘宽 , 莫冠旺 , 李响 , 沈平欢 , 万波 , 刘建坤 . 超大断面扁平结构隧道施工参数优化研究[J]. 黄金科学技术, 2024 , 32(2) : 330 -344 . DOI: 10.11872/j.issn.1005-2518.2024.02.166

Abstract

As the demand for transportation increases in China,more and more highway tunnels adopt the form of super-large section.However,there is still a lack of clear guidance for the design and construction of super-large section tunnels with four lanes or more in the current highway tunnel specifications. There is still a need for in-depth research on the section shape,construction methods,and construction mechanics of super-large section tunnels. Existing research indicates that the use of the benching method for excavation construction of super-large section tunnels is feasible. To obtain the optimized schemes for bench length and anchor rod spacing,numerical simulation was performed in this study to investigate seven different scenarios based on the upper and lower bench construction sections of a certain super-large section flat structure tunnel.The scenarios included bench lengths of 30 m,40 m,50 m,and 60 m,as well as anchor rod longitudinal spacings of 1.0 m,1.5 m,and 2.0 m. The distribution patterns of the plastic zone in the surrounding rock mass,the stress of the surrounding rock,and the deformation of the surrounding rock were analyzed.The study results indicate that the overall maximum principal stress around the tunnel shows a trend of “arch foot>arch waist>arch crown”.An increase in bench length or anchor rod spacing leads to a significant increase in the maximum principal stress at the arch crown. Overall,the settlement and horizontal convergence values of the tunnel arch crowns increase with the increase in bench length. An increase in anchor rod spacing requires other support structures in the initial support to exert stronger control over surrounding rock deformation,potentially leading to the destruction of the support structure. Based on the numerical results and on-site monitoring data,considering factors such as construction efficiency and rock stability,the optimized scheme with a bench length of 50 m and an anchor rod spacing of 1 m was applied in the construction site.The results of this research has high reference value for the optimal selection of excavation and support parameters for super-large section flat structure tunnels.

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