地铁盾构下穿高层建筑基础的扰动变形影响与实测研究
张锟1徐前卫2孙庆文1薛海儒3来守玺3
Disturbance Deformation Influence and Field Measurement Study of Metro Shield Under-passing High Building Foundation
ZHANG Kun1XU Qianwei2SUN Qingwen1XUE Hairu3LAI Shouxi3
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作者信息:1.济南轨道交通集团有限公司， 250014， 济南
2.同济大学道路与交通工程教育部重点实验室， 201804， 上海
3.中铁十局集团第一工程有限公司， 250101， 济南
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Affiliation:1.Jinan Rail Transit Group Co., Ltd., 250014, Jinan, China
2.Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, 201804, Shanghai, China
3.China Railway No.10 Engineering Group First Engineering Co., Ltd., 250101, Jinan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.04.025
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］城市轨道交通建设中遇到越来越多的盾构穿越或近接高层建筑施工的案例，而盾构法因其特殊的施工工艺不可避免对地层产生扰动，严重时可能会影响既有建筑的结构安全，因此需要对盾构穿越过程中隧道及高层建筑的受力特性进行深入研究。［方法］依托济南地铁R2号线生产路站—历黄路站区间隧道工程，采用三维有限元数值方法对双线盾构隧道非同步斜交下穿高层建筑群桩及筏板承台基础的施工过程进行了模拟，并结合现场监测数据分析了地层位移规律、建筑物沉降的变形特征，以及施工时盾构掘进参数的控制效果。［结果及结论］双线盾构隧道先后下穿建筑群桩时，先行隧道开挖引起的地面沉降量较大，后开挖隧道对地层产生的扰动相对较小；盾构通过建筑物正下方时的沉降量最大，随着盾构的远离，其沉降逐渐减少并趋于稳定。由于高层建筑属框架结构，故在临近隧道一侧建筑体区域地层发生了沉降，而在远离隧道的建筑体区域地层呈上浮趋势，但二者的差异沉降量仍在可控范围内。
Abstracts:
［Objective］ With an increasing number of cases involving metro shield tunneling through or in proximity to high buildings in urban rail transit projects, the shield tunneling method inevitably causes disturbances to the ground due to its unique construction process. In several cases, it may impact the structural safety of existing buildings. Therefore, an in-depth study of the force characteristics on both the tunnel and high buildings during shield tunneling is necessary. ［Method］ Leveraging the tunnel construction project of Shengchan Road Sta.-Lihuang Road Sta. interval on Jinan Metro Line R2, a 3D finite element numerical method is employed to simulate the construction process of double-line shield tunnels asynchronous oblique angle under-passing a group of high buildings with pile and raft foundations. Combining with field-monitored data, the law of ground displacement, deformation characteristics of building settlements, and the control effectiveness of shield tunneling parameters during construction are analyzed. ［Result & Conclusion］ When the double-line shield tunnels successively pass beneath the building pile group, the land subsidence caused by leading tunnel excavation is relatively significant, while the disturbance to the ground from subsequent tunnel excavation is relatively small. The maximum subsidence occurs when the shield tunnel is directly beneath the building, and as the shield tunnel moves away, the subsidence gradually decreases and tends to stabilize. Due to the framed structure of the high buildings, partial subsidence occurres on the building area adjacent to the tunnel side, while the part far away from tunnel exhibits an upheaving trend. However, the differences in subsidence amount between the two scenarios remain within a manageable range.
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