既有地铁车站底板开孔的力学特性分析

当新建地铁线换乘车站遇到既有站没有预留换乘条件而需要在既有车站底板开孔以实现换乘时,对既有车站底板开孔后既有站的受力和变形预测很有必要。应用有限元计算软件,计算分析单柱和双柱既有车站站台层底板在不同部位开孔时对既有车站的影响。结果表明,单柱车站和双柱车站底板开孔后的底板变形差异较大,需根据具体情况采用不同的预加固方案。建议尽量在既有底板柱间开孔,同时做好开孔处底纵梁和柱等结构的保护。

Mechanical Property Analysis of Opening Holes in Existing Subway Station Platform Floor

Where there is no designed gallery in the existing subway station holes have to be opened to allow passengers to transfer from the existing subway station to the newly built subway station,and the internal forces and deformation of the existing station have to be predicted after holes are opened. The existing single-pillar and double-pillar stations are analyzed with finite element analysis software where holes are opened in different places in the platform floor. The results show that single-pillar and doublepillar stations differ greatly in internal forces and deformation after holes are opened in different places in the platform floor,and different reinforce measures have to be taken accordingly. It is recommended that holes should be opened between existing floor pillars and bottom girders and pillars should be protected carefully.