盾构近接桥梁及多层建筑施工扰动响应及其控制研究
种记鑫1徐前卫2贺翔2张锟1薛海儒3刘毅1
Disturbance Response and Control of Shield Construction Adjacent to Bridge and High-rise Buildings
CHONG Jixin1XU Qianwei2HE Xiang2ZHANG Kun1XUE Hairu3LIU Yi1
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作者信息:1.济南轨道交通集团有限公司，250101，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，250001，济南
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Affiliation:1.Jinan Rail Transit Group Co., Ltd., 250101, Jinan, China
2.Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, 201804, Shanghai, China
3.China Railway Tenth Bureau Group First Engineering Co., Ltd., 250001, 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.2024.12.024
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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］济南轨道交通2号线生产路站—历黄路站区间隧道从高架桥梁和欧亚电子大厦群桩基础之间近距离侧穿，为了确保盾构施工顺利实施及既有建筑物的安全，有必要对盾构侧穿引起的周围地层及建筑物的结构响应机理进行研究。［方法］采用有限元模拟，研究了盾构隧道右线和左线穿越过程中，加固前、后邻近桥梁基础、桩基及地面的变形情况，并结合现场监测结果，对数值模拟过程进行了对比分析。［结果及结论］当左、右线施工间隔在200环范围内时，双线施工对地层的扰动效应会产生叠加效应，并会导致地层及周围建筑物结构变形超限，影响其使用安全。在隧道周围3m范围内实施二次注浆加固，建筑物楼板及靠近隧道一侧的柱子所产生的负弯矩降低了45.01%，地面及周围建筑物变形范围及大小均降低至设计限值以内，说明二次注浆可以有效抑制盾构掘进导致的地层扰动效应。结合现场监测结果可知，盾构掘进期间，地层及桩基础变形均可满足要求。
Abstracts:
［Objective］ The tunnel between Shengchanlu Station and Lihuanglu Station on Jinan Metro Line 2 passes in close proximity to the pile foundations of an elevated bridge and the Eurasia Electronics Building complex. To ensure the smooth implementation of shield tunneling and the safety of existing structures, it is necessary to study the structural response mechanism of the surrounding soil and buildings due to shield tunnel side-passing construction. ［Method］ Using finite element simulation, the deformation of adjacent bridge foundation, pile foundation, and ground surface before and after reinforcement during the right and left line shield tunnel crossings is examined. A numerical simulation process is comparatively analyzed with reference to field monitoring data. ［Result & Conclusion］ When the construction interval between the left and right lines is within 200 rings, the disturbance effect from dual-line construction may have a superimposed impact, potentially causing excessive deformation of the surrounding soil and building structures, thus jeopardizing the usage safety. Implementing secondary grouting reinforcement within 3 m radius around the tunnel reduces the negative bending moment in the building floor slabs and the columns closest to the tunnel by 45.01%, while reducing the extent and magnitude of ground surface and surrounding building deformation within the design limits, indicating that the secondary grouting can effectively mitigate the stratum disturbance effects caused by shield tunneling. Field monitoring results confirm that soil and pile foundation deformations remain within acceptable limits during the shield tunneling.
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