考虑双线掘进和建筑结构耦合作用时地铁盾构下穿建筑物施工的地面沉降规律
王鹏飞1邹利2乙珂豪3孙萌萌3吴静红3
Land Subsidence Law of Subway Shield Tunnel Construction Under-Crossing Buildings Considering the Coupling Effect of Double-Line Tunneling and Building Structure
WANG Pengfei1ZOU Li2YI Kehao3SUN Mengmeng3WU Jinghong3
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作者信息:1.昆山市建设工程质量检测中心, 215300, 苏州
2.昆山市住房和城乡建设局, 215300, 苏州
3.苏州科技大学土木工程学院, 215011, 苏州
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Affiliation:1.Kunshan Construction Engineering Quality Inspection Center, 215300, Suzhou, China
2.Kunshan Housing and Urban Rural Development Bureau, 215300, Suzhou, China
3.School of Civil Engineering, Suzhou University of Science and Technology, 215011, Suzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.027
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中图分类号/CLCN:TU433
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栏目/Col:研究报告
摘要:
［目的］城市软土地层中双线隧道下穿建筑结构引起的地面变形较为复杂，有必要研究双线隧道和上部建筑物的耦合作用对地面变形的影响。［方法］依托苏州轨道交通11号线工程的监测数据，利用PLAXIS 3D软件，采用小应变本构模型建立三维隧道数值模型，研究双线隧道盾构施工时的地面沉降规律，进而讨论双线隧道及建筑物参数的影响作用。在此基础上运用全局敏感性分析法对多个影响参数进行敏感性评估。［结果及结论］下穿建筑的双线隧道地面沉降曲线呈现近似对称的U形分布，最大沉降位置向先行隧道偏移。与先行隧道相比，后建隧道施工对地面沉降的影响较小。建筑结构所在地面呈现下凹式挠曲变形。建筑物自重、长宽比同地面沉降呈正相关，隧道埋深、间距、施工步距、建筑物刚度同地面沉降呈负相关。
Abstracts:
［Objective］ Ground deformation caused by double-line tunnels under-crossing building structures in urban soft soil stratum is relatively complex. It is necessary to study the influence of the coupling effect of double-line tunnel and the upper buildings on ground deformation. ［Method］ Relying on the monitoring data of Suzhou Rail Transit Line 11 project, a 3D tunnel numerical model using the small-strain intrinsic model with PLAXIS 3D software is established, and the land subsidence pattern during the double-line tunnel shield construction is studied. Then, the influence of the double-line tunnel and building parameters is discussed. On this basis, the global sensitivity analysis method is used to evaluate the sensitivity of multiple influencing parameters. ［Result & Conclusion］ Land subsidence curves of the double-line tunnels under-crossing buildings show an approximately symmetrical U-shaped distribution, with the maximum settlement position leaning towards the advancing tunnel. Compared with the advancing tunnel, the construction of the following tunnels has less impact on land subsidence. The ground where the building structure is located presents a concave flexural deformation. The building′s deadweight and aspect ratio are positively correlated with land subsidence, while the tunnel depth, spacing, construction step, and building stiffness are negatively correlated with land subsidence.
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