基坑工程对轨道交通高架区间影响分析

Influence Analysis of Foundation Pit Engineering on the Elevated Section of Rail Transit

厦门机场大道地下通道与轨道交通3,4号线高架区间正交,通过数值模拟分析,研究通道基坑施工对轨道交通高架区间结构可能产生的影响。结果表明:邻近高架结构变形以水平变形为主,竖向变形较小;轨道交通高架结构产生的附加弯矩增加不大,通道底板施工完毕后趋于稳定;支撑与围护结构刚度的增强,分段跳仓开挖,以及基坑被动区土体加固改良,有助于控制基坑变形。提出了轨道交通高架结构的保护措施,以确保安全。

The underground passage of Xiamen airport avenue and the elevated section of Xiamen rail transit line No.3 and No.4 are orthogonal.Through a numerical simulation,the possible influence of the foundation pit construction of the underground passage on the elevated section has been studied.The result shows that,the deformation of adjacent viaduct structure is mainly horizontal,while the vertical deformation is small.The additional bending moment generated by foundation pit construction on rail transit elevated structure does not increase much and tends to be stable after the completion of foundation slab construction.And the deformation of foundation pit can be controlled by strengthening the stiffness of bracing and retaining structure,excavating by section,strengthening and improving the soil in the passive area of the pit.The protection measures have been proposed to guarantee safety of the elevated structure of the rail transit.