地铁盾构隧道下穿古建筑影响及控制措施
何晟亚1李恒一1王志杰2
Impact and Control Measures of Subway Shield Tunnel Underpassing Ancient Buildings
HE Shengya1LI Hengyi1WANG Zhijie2
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作者信息:1.广州地铁设计研究院股份有限公司， 510010， 广州
2.西南交通大学交通隧道工程教育部重点实验室， 610031， 成都
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Affiliation:1.Guangzhou Metro Design & Research Institute Co., Ltd., 510010, Guangzhou, China
2.Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.022
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］为了明确软土地区隧道施工及运营对古建筑的影响，并制定相应的控制方案，有必要研究地铁隧道施工对古建筑的影响控制问题。［方法］以深圳地铁3号线下穿坪西萧氏碉楼为例，建立了大型三维计算模型，研究了隧道施工掘进及列车振动对碉楼结构的影响，对比了桩梁托换和基础注浆加固的控制效果，确定了优选控制措施，并结合现场监测结果，验证了所提控制措施的可行性。［结果及结论］若未采取控制措施，地铁隧道施工会造成碉楼严重的整体性倾斜，运营期列车运行引起的碉楼顶部水平振动速度达到了1.41 mm/s，不满足控制要求。采用基础注浆加固措施后的碉楼顶部沉降值仅降低了17.5%，而采用桩梁托换措施后，基本可以解决碉楼基础整体性下沉问题，碉楼振动速度降低为0.33 mm/s，结构最大响应应力为30.39 kPa。根据现场监测数据可知，采用桩梁托换措施后的碉楼顶部沉降、碉楼倾斜率及地面沉降分别为10 mm、 0.4‰和12 mm，分别低于14 mm、 2.0‰和30 mm的控制值。开展软土地区结构稳定性控制时，应充分运用桩式加强措施，并保证桩端嵌入有效持力层。
Abstracts:
［Objective］To clarify the impact of tunnel construction and operation in soft soil areas on ancient buildings, and formulate corresponding control plans, it is necessary to study the control of subway tunnel construction impact on ancient buildings.［Method］Taking Shenzhen Metro Line 3 under the Xiao′s Diaolou (watchtower) in Pingxi Community as an example, a large-scale three-dimensional calculation model is established to study the influence of tunnel construction and train vibration on the Diaolou structure. The control effects of pile-beam underpinning and foundation grouting reinforcement are compared, and the optimal control measures are determined. Combined with the on-site monitoring results, the feasibility of proposed control measures is verified.［Result & Conclusion］If no control measures are taken, the construction of subway tunnel may cause severe overall tilt of Diaolou. During operation periods, the horizontal vibration velocity at top of Diaolou caused by trains reaches 1.41 mm/s, failing to meet the control requirements. Upon foundation grouting reinforcement measures, the settlement value at top of Diaolou is only reduced by 17.5%, while the overall sinking problem of the Diaolou foundation can be basically solved after adopting pile-beam underpinning measures, with Diaolou’s vibration velocity reduced to 0.33 mm/s, and its structure maximum response stress is 30.39 kPa. According to on-site monitoring data, the Diaolou top settlement, Diaolou tilt rate and land subsidence after adopting pile-beam underpinning measures are 10 mm, 0.4‰ and 12 mm respectively, lower than the control values of 14 mm, 2.0‰ and 30 mm. When carrying out structural stability control in soft soil areas, pile reinforcement measures should be fully utilized, and the pile ends be certainly embedded to the effective bearing layer.
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