防灾与环境

基于影像源法的基坑开挖引起下卧隧道变形分析

  • 魏纲 ,
  • 周烨波 ,
  • 王哲 ,
  • 齐永洁 ,
  • 徐天宝
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  • 1.浙大城市学院 土木工程系,杭州 310015;
    2.城市基础设施智能化浙江省工程研究中心,杭州 310015;
    3.浙江工业大学 岩土工程研究所,杭州 310014;
    4.浙江大学 滨海和城市岩土工程研究中心,杭州 310058;
    5.中铁十五局集团第五工程有限公司,天津 300131
魏纲(1977—),男,杭州人,博士,教授,主要从事地下隧道与周边环境相互影响及风险评估与控制。E-mail:weig@hzcu.edu.cn
王哲(1978—),男,山东济宁人,博士,教授,主要从事软土地下工程及能源地下结构研究。E-mail:wangzsd@ziut.edu.cn

收稿日期: 2025-09-07

  网络出版日期: 2026-09-07

基金资助

国家自然科学基金(52578490);浙江省自然科学基金(LMS26E080035)

Deformation Analysis of Underlying Tunnels Induced by Excavation Based on the Image Source Method

  • Wei Gang ,
  • Zhou Yebo ,
  • Wang Zhe ,
  • Qi Yongjie ,
  • Xu Tianbao
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  • 1. Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, P.R. China;
    2. Zhejiang Provincial Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou 310015, P.R. China;
    3. Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China;
    4. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P.R. China;
    5. China Railway 15th Bureau Group 5th Corporation Limited, Tianjin 300131, P.R. China

Received date: 2025-09-07

  Online published: 2026-09-07

摘要

基坑开挖会引起盾构管片产生变形,但目前关于考虑围压影响下盾构隧道精细化模型相关研究较少。基于隧道衬砌附加围压计算公式,结合实际案例建立三环盾构管片精细化模型,进行结构计算分析,将隧道变形计算值与实测值对比,验证了模型的可靠性。采用椭圆度及标准变形控制值作为隧道安全状况的评价指标,研究基坑开挖卸荷对隧道的影响规律。结果表明:在基坑开挖过程中,隧道管片的变形机制逐渐从下方土体卸载主导转变为基坑开挖卸载主导,水平位移随之显著增大;同一开挖进度下,隧道顶部竖向位移变化幅度大于隧道底部;管片之间的接缝处应力较大,混凝土最大应力发生在标准块连接处,螺栓最大应力发生在环与环之间的连接螺栓处;隧道距离基坑底部净距越大,隧道顶部位移越小而底部位移越大,水平位移逐渐增大;基坑开挖过程中隧道变形和椭圆度严格控制在控制范围内,基坑开挖完毕后若继续向下开挖,隧道变形量与椭圆度将逐渐超出控制值。

本文引用格式

魏纲 , 周烨波 , 王哲 , 齐永洁 , 徐天宝 . 基于影像源法的基坑开挖引起下卧隧道变形分析[J]. 地下空间与工程学报, 2026 , 22(4) : 1451 -1459 . DOI: 10.20174/j.JUSE.2026.04.33

Abstract

Pit excavation will cause deformation of the shield tube sheet, but there are fewer studies related to the refinement model of shield tunnel under the consideration of peripheral pressure. Based on the formula for calculating the additional peripheral pressure of tunnel lining, the article establishes a refined model of a three-ring shield tubular sheet in combination with practical cases, carries out structural calculation and analysis, and compares the calculated values of tunnel deformation with the measured values to verify the reliability of the model in this paper. Ellipticity and standard deformation control values are used as indicators to assess the tunnel's safety condition. The influence law of pit excavation and unloading on the tunnel is studied. The results show that: In the process of foundation pit excavation, tunnel segments gradually change from soil unloading control under the tunnel to unloading control caused by foundation pit excavation, and the horizontal displacement gradually increases. Under the same excavation schedule, the vertical displacement at the top of the tunnel changes more than that at the bottom; the stress at the joints between the tube pieces is larger, the maximum stress of concrete occurs in the connection place of the standard block, and the maximum stress of bolts occurs in the connection place of the bolts between the rings; the clear distance of the tunnel from the bottom of the foundation pit is larger than that between the tunnel pieces. The larger the clear distance of the tunnel from the bottom of the pit, the smaller the displacement at the top of the tunnel and the larger the displacement at the bottom, and the horizontal displacement gradually increases; the deformation and ellipticity of the tunnel are strictly controlled in the process of excavation of the pit, and the deformation and ellipticity of the tunnel will gradually exceed the control value if the excavation is continued after the pit is finished.

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