岛式地铁车站施工对邻近桥梁桩基的影响分析

Analysis on Influences of Construction of Island Form Metro Station on Adjacent Bridge Piles

以北京某在建地铁工程为例,运用FLAC软件对分离岛式地铁车站通过邻近桥桩整个施工过程进行模拟,分析了两种不同施工方案即桥桩加固方案和未加固方案时车站施工对于桥桩附近地面沉降、桥桩弯矩及轴力等参数的影响。研究结果表明,桥桩加固方案有效地控制了桥桩附近土体沉降,效果优于未加固方案,但车站结构的拱顶沉降由于围护结构加固的不对称设计,桥桩加固方案下要大于未加固方案。

Taking a subway project under construction in Beijing as an example, FLAC software was utilized to simulate the whole construction process of separated island form metro station passing by the adjacent bridge piles, and the impacts of the ground settlement nearby the piles, the moment and axial force of piles on the station construction under two different construction schemes, namely the scheme with reinforced piles and that with unreinforced ones were analyzed. The researeh result indicates that the reinforced piles scheme could decrease the settlement of the metro station＇s vault, and control the ground settlement nearby the piles effectively, and the effect is superior to the latter scheme.