盾构法联络通道不同开洞位置对主隧道管片内力影响
周萌
Influence of Different Opening Positions of Shield Method Connecting Passage on Main Tunnel Segment Internal Force
ZHOU Meng
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作者信息:中铁上海设计院集团有限公司，200070，上海
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Affiliation:Influence of Different Opening Positions of Shield Method Connecting Passage on Main Tunnel Segment Internal Force
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.014
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栏目/Col:研究报告
摘要:
［目的］在9m级大直径盾构中，尚无采用盾构法进行联络通道施工的工程案例，受限界及疏散平台高度影响，联络通道与主隧道之间存在一定偏心距，主隧道结构面临着盾构偏心始发和接收的影响，需研究盾构法联络通道不同开洞位置对主隧道管片内力的影响。［方法］依托某市域铁路工程，采用数值模拟方法，分析不同偏心距下盾构法联络通道施工始发和接收阶段主隧道管片力学响应。［结果及结论］盾构法联络通道施工过程中，最不利阶段为作用在盾构反力架上的推力为0的工况；随着偏心距的增大，主隧道特殊管片收敛变形，以及钢管片、混凝土管片内力逐渐减小，但环缝剪力和纵缝剪力逐渐增大；在开洞侧与特殊管片相邻的普通混凝土管片的内力也会发生显著的增大，需要在结构设计中重点关注。
Abstracts:
［Objective］ In the 9 m level large-diameter shield tunneling, there are no engineering cases using shield method for constructing connecting passages yet. Due to the influence of clearance and evacuation platform height, a certain eccentricity exists between the connecting passage and the main tunnel, resulting in the impact of shield launching and receiving with eccentricity for main tunnel structure. It is necessary to investigate the influence of different opening positions of shield method connecting passage on the internal forces of main tunnel segments. ［Method］ Based on a city railway project, numerical simulation method is used to analyze the mechanical response of main tunnel segments during the launching and receiving stages of above connecting passage construction under different eccentricity conditions. ［Result & Conclusion］ During the construction of shield method connecting passages, the most critical stage is when the thrust acting on the shield reaction frame is zero. As the eccentricity increases, the convergence deformation of special segments in main tunnel and the internal forces in steel and concrete segments gradually decrease, while the circumferential and longitudinal shear forces gradually increase. The internal forces in ordinary concrete segments adjacent to the special segments on the opening side also increase significantly, which requires special attention in structure design.
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