大跨度地铁车站十导洞洞桩法施工变形规律及其影响因素研究
周涛
Research on Deformation Patterns and Influencing Factors of Ten Pilot Tunnel Pile Method Construction in Large Span Metro Stations
ZHOU Tao
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作者信息:长沙市城投基础设施建设项目管理有限公司，410011，长沙
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Affiliation:Changsha Urban Investment Infrastructure Construction Project Management Co.,Ltd.,410011,changsha, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.010
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中图分类号/CLCN:U231.4
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栏目/Col:研究报告
摘要:
［目的］为确保大跨度地铁车站施工安全，需对十导洞洞桩法施工过程中车站结构的变形规律及其影响因素进行研究。［方法］以西黄村站为工程背景，建立了大跨度车站十导洞洞桩法施工数值模型，分析了不同施工阶段地面的沉降以及桩的水平变形规律，研究了导洞开挖顺序、导洞开挖错距及扣拱施工顺序等三种因素对地面沉降的影响规律。［结果及结论］车站上方导洞以及中间导洞施工对地面沉降的影响较大；各施工阶段的地面沉降规律均满足正态分布，最大沉降位于车站中线处，导洞施工及扣拱施工两个阶段引起的地面沉降占总沉降的74.7%。车站负二层土体开挖后，桩在水平方向的约束急剧减弱，导致桩水平变形增大。先开挖下层导洞引起的地面沉降较小；随着导洞开挖错距的增大，地面最大沉降逐渐减小；先开挖两侧扣拱再依次开挖中间扣拱的施工顺序引起的地面沉降最小。
Abstracts:
［Objective］ To ensure the construction safety of large span metro stations, it is necessary to conduct research on the deformation patterns of the station structure and the influencing factors in the construction process of ten pilot tunnel pile method. ［Method］ With Xihuang Village Station as the engineering background, a numerical model for the construction of ten pilot tunnel pile method in large span stations is established. The patterns of ground settlement law and the pile horizontal deformation patterns at different construction stages are analyzed. The influence pattern of the three factors, namely the excavation sequence of pilot tunnels, the staggered distance of pilot tunnel excavations, and the construction sequence of arch closing, on the ground settlement is studied. ［Result & Conclusion］ The construction of the upper pilot tunnels and the middle pilot tunnels above the station has a greater impact on the ground settlement. The ground settlement patterns of each construction stage all conform to the normal distribution. The maximum settlement locates at the center line of the station，and the ground settlement caused by the pilot tunnel construction and the arch closing construction accounts for 74.7% of the total settlement. After the excavation of the soil on the second basement level of the station, the horizontal restraint of the piles is sharply weakened, resulting in increased horizontal deformation of the piles. The ground settlement caused by the first excavation of the lower pilot tunnels is relatively small. As the staggered distance of the pilot tunnel excavation increases, the maximum ground settlement gradually decreases. The construction sequence of first excavating the side arch closings and then successively excavating the middle arch closings causes the least ground settlement.
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