新建车站采用PBA法密贴下穿既有车站施工时对既有车站结构变形的影响规律
田江涛1王子杰2
Influence Law of PBA Method New Station Closely Undercrossing Existing Station on Its Structural Deformation
TIAN Jiangtao1WANG Zijie2
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作者信息:1.武汉地铁集团有限公司，430030，武汉
2.河北科技师范学院城市建设学院，066004，秦皇岛
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Affiliation:1.Wuhan metro group Co., Ltd., 430030, Wuhan, China
2.Hebei Normal University Of Science & Technology College of Urban Construction，066004，Qinhuangdao,China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.036
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中图分类号/CLCN:TU94∶U231.4
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栏目/Col:研究报告
摘要:
［目的］新建车站密贴下穿既有车站施工时,会对既有车站结构变形产生影响,需研究其影响规律。［方法］依托北京地铁6号线苹果园站密贴下穿既有车站工程，采用GTS-NX有限元分析软件建立有限元模型。通过与实际监测结果的对比，验证了有限元模型的计算准确性。基于有限元模型计算结果，研究了PBA（洞桩）法施工对既有车站的影响，并分析了既有车站的存在对地面沉降的影响。［结果及结论］在PBA法施工过程中，对既有车站轨道结构及既有车站结构影响较大的施工阶段为导洞开挖阶段及二次衬砌扣拱阶段；越靠近既有车站，地面沉降值越小；在监测断面位置相同时，既有车站结构断面越大，地面沉降越小；在既有车站断面尺寸相同时，越靠近新建车站开挖中心线，地面沉降值越大；既有车站影响范围与既有车站结构的断面尺寸有关。
Abstracts:
［Objective］ A new station constructed with PBA method closely undercrossing existing station will influence the deformation of the latter′s structure. The influence law needs to be studied. ［Method］ Based on the project of Pingguoyuan Station on Beijing Metro Line 6 closely undercrossing the existing station, a finite element model is established by the GTS-NX finite element analysis software, and its computing accuracy is verified through comparison with the actual monitored results. According to the calculation results of the finite element model, the impact of PBA (pile beam arch) method construction on the existing station is studied, and the influence of the existing station on land subsidence is analyzed. ［Result & Conclusion］ In the process of PBA construction, the construction stages that greatly affect the track structure and the building structure of the existing station are the guiding hole excavation and the second lining arch stages. The closer the construction is to the existing station, the smaller the land subsidence. When the monitoring sections are at the same location, the larger the existing station structure section, the smaller the land subsidence. With the same section size of the existing station, the closer to the excavation centerline of the new station, the greater the land subsidence value. The influence range of the existing station is related to the sectional size of the existing station structure.
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