施工荷载耦合作用下超大直径盾构隧道结构力学响应
马晓波
Mechanical Response of Super-large Diameter Shield Tunnel Structure under Construction Load Coupled Action
MA Xiaobo
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作者信息:1.中铁第一勘察设计院集团有限公司， 710043， 西安；
2.陕西省铁道及地下交通工程重点实验室(中铁一院)， 710043， 西安
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Affiliation:1.China Railway First Survey and Design Institute Group Co., Ltd., 710043, Xi’an, China;
2.Shaanxi Railway and Underground Traffic Engineering Key Laboratory (FSDI), 710043, Xi’an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20245755
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中图分类号/CLCN:U451∶U455.43
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栏目/Col:土建工程
摘要:
［目的］超大直径盾构隧道在施工过程中受到多种力的共同作用，易导致结构损伤和渗漏。为保障衬砌管片结构的安全性，需要针对其在多重施工荷载耦合作用下的力学响应特性开展研究。［方法］依托某超大直径盾构隧道工程，采用数值模拟方法，借助ABAQUS软件建立了包含22环管片和连接螺栓在内的超大直径盾构隧道三维数值模型。通过与同类型试验结果对比，验证了模型的准确性和可行性。充分考虑隧道埋深和盾构姿态的影响，进行三维数值模型计算，分析了不同位置衬砌管片及螺栓的受力变形特征。［结果及结论］千斤顶推力对衬砌管片的影响范围主要为前8环，对螺栓的影响则主要集中在前4环。不同盾构掘进姿态下，同侧管片受力状态变化更为显著。管片受力变形对隧道埋深的敏感度较大，而受掘进姿态的影响相对较小。随着隧道埋深的增加，衬砌拱顶位移呈减小趋势，拱腰及拱底位置则整体表现为增大趋势。不考虑施工误差时，环缝螺栓应力受埋深变化的影响很小，最大螺栓受力位置普遍集中在拱腰处，应特别关注衬砌拱腰位置处螺栓的受力状态及相应螺栓孔和手孔的损伤情况。
Abstracts:
［Objective］ During construction, super-large diameter shield tunnels are subjected to multiple forces which may easily cause structural damage and waste leakage. To ensure the safety of the segmental lining structure, it is necessary to study its mechanical response characteristics under the coupled action of various construction loads. ［Method］ Based on an actual super-large diameter shield tunnel project, the numerical simulation method is adopted, and a three-dimensional numerical model for super-large diameter shield tunnel consisting of 22 segmental rings and connecting bolts is established using ABAQUS software. The accuracy and feasibility of the model are validated by a comparison with experimental results of the same type. The effects of tunnel burial depth and shield posture are fully considered in the 3D numerical model calculation, the stress and deformation characteristics of lining segments and bolts at different positions are analyzed. ［Result & Conclusion］ The influence range of jacking thrust on the lining segments mainly covers the first eight rings, while its effect on the bolts is primarily concentrated in the first four rings. Under different shield tunneling postures, the stress state of segments on the same side shows more significant changes. The stress and deformation of segments are highly sensitive to tunnel burial depth but relatively less affected by shield postures. As burial depth increases, the displacement at lining arch vault decreases, while the displacements at arch waist and arch invert tend to increase overall. When construction errors are not considered, the influence of burial depth on the stress of circumferential bolts is minimal. Since the locations of maximum bolt stress generally concentrate at arch waist, it is recommended to pay special attention to the stress state of bolts and the potential damage to bolt holes and hand holes at lining arch waist.
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