偏心开洞条件下市域铁路机械法联络通道施工力学响应分析
李逸涛1,2孙双篪3余鲸3周萌1汪文忠1
Construction Mechanical Response Analysis of City Railway Machinary Method Link Passage under Eccentric Opening Conditions
LI Yitao1,2SUN Shuangchi3YU Jing3ZHOU Meng1WANG Wenzhong1
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作者信息:1.中铁上海设计院集团有限公司， 200070， 上海
2.上海市轨道交通结构耐久与系统安全重点实验室， 201804， 上海
3.上海申铁投资有限公司， 200030， 上海
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Affiliation:1.China Railway Shanghai Design Institute Group Co., Ltd., 200070, Shanghai, China
2.Shanghai Key Laboratory of Durability and System Safety of Rail Transit, 201804, Shanghai, China
3.Shanghai Shen-Tie Investment Co., Ltd., 200030, Shanghai, China
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Key words:
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DOI:10.16037/j.1007-869x.20245933
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中图分类号/CLCN:U455.43；TU431
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栏目/Col:土建工程
摘要:
［目的］机械法联络通道施工技术在以地铁为代表的6 m级别直径盾构隧道中已得到广泛应用，但在市域铁路这类采用9 m级别直径的大盾构隧道中尚无工程实践案例，也鲜有相关研究。［方法］针对某市域铁路9 m级别直径盾构隧道，建立了“主隧道+联络通道”的三维荷载结构模型，考虑不同的埋深、土层参数、盾构机推力等条件，从不同工况下主隧道特殊管片的变形、轴力、弯矩3个方面分析了机械法联络通道施工对主隧道结构的影响。［结果及结论］联络通道施工引起的附加变形受到埋深和盾构机推力共同影响，当埋深较大时，联络通道施工会增大主隧道收敛变形，埋深较小时则相反，盾构反力的增大会进一步减小主隧道收敛变形。主隧道内力变化主要集中在3环特殊管片中的钢管片部分，其半开洞环在拱腰处的轴力、弯矩均会显著增大，最大出现在运营工况，需要在设计时对其重点关注，而混凝土管片的内力变化则较小。
Abstracts:
［Objective］ The machinery construction method for link passages has been widely applied in 6-meter-class diameter shield tunnels, typically used in metro projects. However, there are few engineering practice cases and the limited research regarding its application in city railway tunnels, where 9-meter-class large-diameter shields are used. ［Method］ Focusing on a city railway project with 9-meter-class diameter shield tunnel, a three-dimensional load structure model of main tunnel and link passage is established. Under varying conditions of burial depth, soil parameter, and shield machine thrust, the impact of link passage construction on the main tunnel structure is analyzed from three aspects: deformation, axial force, and bending moment of special segments under different operating conditions. ［Result & Conclusion］ The additional deformation caused by the construction of link passage is influenced by both the burial depth and the thrust of the shield machine. When the burial depth is large, the link passage construction will increase the convergence deformation of the main tunnel; when the burial depth is small, it reduces the convergence deformation. An increase in shield machine thrust further reduces the convergence deformation of the main tunnel. Changes in the main tunnel internal forces are mainly concentrated in the steel segment sections of the three-ring special segments, where the axial force and bending moment at the arch waist of semi-open segment significantly increase, with the maximum occurring under operational conditions, which requires special attention during design. In contrast, internal force changes in the concrete segments are relatively minor.
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