软土地层浅埋暗挖矩形大断面隧道施工力学响应特征
吴康1申玉生2易鹏豪2宗志栓1邱泽刚1陈晨1
Mechanical Response Characteristics of Shallow-buried Concealed Rectangular Large-section Tunnel in Soft Soil Stratum
WU Kang1SHEN Yusheng2YI Penghao2ZONG Zhishuan1QIU Zegang1CHEN Chen1
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作者信息:1.中铁十五局集团有限公司，200040，上海
2.西南交通大学交通隧道工程教育部重点实验室，610031，成都
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Affiliation:1.China Railway 15 Bureau Group Co., Ltd., 200040, Shanghai, China
2.Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.007
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］为探究在城市软土地层中安全有效地施工浅埋暗挖矩形大断面隧道的技术方法，以实现施工过程的安全性控制。［方法］以某地铁区间隧道工程为例，提出4导洞开挖和“中导洞”先行6导洞两种开挖方案。利用有限差分软件建立三维数值仿真模型，模拟了隧道施工过程并详细分析了隧道施工过程中的地层竖向位移和初期支护内力变化。通过与现场监测数据分析对比，验证了所提工法的合理性与有效性。［结果及结论］在导洞开挖阶段，隧道顶部和底部的地层竖向位移最为显著，且相邻导洞的开挖对位移影响有限。采用6导洞开挖方案，与4导洞开挖方案相比，底部最大位移值显著减少了21.5%，同时在施工过程中，底部的竖向位移速率也降低了6.1%。特别是在中导洞施工期间，地层竖向位移变化速率是侧导洞变化速率的1.2倍左右，这表明中导洞对地层的影响更为显著。6导洞开挖方案在控制施工期间地层变形和结构受力方面更为有效，特别是在中导洞施工阶段，需要特别关注并加强监控和支护措施。
Abstracts:
［Objective］ The study aims to explore the technical methods for safe and effective construction of shallow-buried concealed rectangular large-section tunnels in urban soft soil stratum, so as to achieve safety control of the construction process. ［Method］ Taking a subway section tunnel project as example, the 4-guiding hole excavation and the 6-guiding hole with middle-guiding hole leading excavation two schemes are proposed. A three-dimensional numerical simulation model is established using finite difference software, to simulate the tunnel construction process and analyze the vertical displacement of the stratum and the changes in the initial support internal force during the tunnel construction process in detail. By analyzing and comparing with the on-site monitoring data, the rationality and effectiveness of the proposed scheme are verified. ［Result & Conclusion］ During the guiding hole excavation phase, the vertical stratum displacement at the top and bottom of the tunnel is most significant, and the excavation of the adjacent guiding hole has limited influence on the displacement. Using the 6-guiding hole excavation scheme, the maximum displacement value at the bottom is significantly reduced by 21.5% compared with the 4-guiding hole excavation scheme. At the same time, the vertical displacement rate at the bottom is also reduced by 6.1% during the construction process. In particular, during the construction of the middle guiding hole, the change rate of the vertical stratum displacement is about 1.2 times of that of the side guiding hole, indicating that the middle guiding hole has a more significant impact on the stratum. The 6-guiding hole excavation scheme is more effective in controlling stratum deformation and structural stress during construction, especially during the construction stage of the middle guiding hole, thus requiring special attention and strengthened monitoring and support measures.
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