上海市域铁路机场联络线大盾构隧道结构在列车荷载下的动力响应分析
陈扬勋
Dynamic Response Analysis of Large Shield Tunnel Structure of Shanghai Urban Railway Airport Link under Train Load
CHEN Yangxun
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作者信息:1.中铁第四勘察设计院集团有限公司，430063，武汉
2.上海地下基础设施安全检测与养护装备工程技术研究中心，200092，上海
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Affiliation:1.China Railway Siyuan Survey and Design Group Co., Ltd., 430063, Wuhan, China
2.Shanghai Engineering Research Center of Underground Infrastructure Detection and Maintenance Equipment, 200092, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.023
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中图分类号/CLCN:U451+.3
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栏目/Col:研究报告
摘要:
［目的］装配式单线双洞大直径盾构隧道越来越频繁地应用于地下轨道交通线路中，提高了地下空间的使用效率。但其中隔墙与隧道结构的连接较为薄弱，会对运营安全产生影响，故需要研究装配式大盾构隧道中隔墙及其顶部节点在列车动力荷载作用下的动力响应。［方法］以上海市域铁路机场联络线单洞双线大直径盾构隧道工程为依托，采用数值模拟方法，研究了列车荷载作用下装配式隧道内部结构的动力响应，对中隔墙和顶部薄弱节点的安全性能进行了验算分析，并对比了单车工况、对向列车荷载动力响应的差异情况。［结果及结论］在列车竖向荷载的作用下，管片变形有由横鸭蛋形向竖鸭蛋形变化的趋势，并在列车荷载经过后恢复初始的横鸭蛋形状态；会车工况下衬砌收敛减小值是单车工况下衬砌收敛减小值的2倍；顶部螺栓承载符合规范要求，在列车动荷载影响下，可至少正常工作114年；在列车风荷载作用下，中隔墙顶部节点水平位移增大，会车工况下水平位移是单车工况下水平位移的2.8倍；隧道结构无共振风险。
Abstracts:
［Objective］ The prefabricated single hole double track large-diameter shield tunnels are more frequently applied in underground rail transit lines, improving the efficiency of underground space utilization.However, the weak connection between the middle partition wall and the tunnel structure affects the operation safety.Therefore, it is necessary to study the dynamic response of the middle partition wall and its top nodes in prefabricated shield tunnels under train dynamic loads. ［Method］ Based on the single hole double track large-diameter shield tunnel project of Shanghai Municipal Railway Airport Link, the dynamic response of the internal structure of the prefabricated tunnel under train load is studied by numerical simulation. The safety performance of the middle partition wall and the weak top nodes is verified and analyzed, and the difference between the dynamic responses under single train load and opposite train load are compared. ［Result & Conclusion］ Under the action of vertical train load, the segment deformation presents a tendency of change from horizontal duck egg to vertical duck egg, and resumes the initial state of horizontal duck egg after the train load passes by. The convergence reduction value of the lining under the train meeting condition is twice that under the single train condition. The bearing capacity of the top bolt meets the requirements of the standard and can work normally for at least 114 years under the effect of the train dynamic load. Under the action of the train wind load, the horizontal displacement of the top node on the middle partition wall increases, and under the train meeting condition is 2.8 times that under single train condition. The tunnel structure has no resonance risk.
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