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本文通过现场实测数据分析了大型基坑分区开挖对临近地铁车站以及车站两端盾构隧道竖向和水平向变形的影响。分析结果表明:受邻近基坑开挖卸荷的影响,在竖直方向车站产生了隆起变形,盾构隧道受地质条件差异和施工参数的影响,既有沉降也有隆起;在水平方向车站和隧道均朝向基坑移动;流变对车站和隧道竖向变形影响较大,因流变而产生的竖向变形可占总变形的50%;分区开挖由于可以充分利用中隔墙对基坑变形的约束,以及时空效应对变形的影响,因此可以有效地减小基坑开挖对邻近地铁变形的影响。
In this paper, the influence of excavation of large excavation on the vertical and horizontal deformation of the shield tunnel near the metro station and the station at both ends of the station is analyzed by field measured data. The analysis results show that the vertical deformation of the station is caused by the unloading of adjacent excavation. The shield tunnel is affected by the difference of geological conditions and construction parameters. Both the settlement and the uplift of the shield tunnel are significant. In horizontal stations and tunnels All of them move towards the foundation pit. Rheology has a great influence on the vertical deformation of the station and the tunnel. The vertical deformation due to the deformation can account for 50% of the total deformation. As the excavation in the area can make full use of the deformation of the foundation pit , And the effect of space-time effect on the deformation, so it can effectively reduce the impact of excavation on the deformation of the adjacent subway.