通过对叠合梁受弯过程中的工作原理及内力分配效应的介绍，演绎出叠合梁在这类受力时所产生的一个共同效应，并将叠合梁这一效应引入到地铁明挖车站深基坑设计计算中来，然后再结合沈阳地铁二号线工业展览馆站的实例，详细分析和阐述这一效应在地铁深基坑计算过程中的应用，从而给相关专业的设计提供一些参考。

 The working principle and internal force distribution effect of bended composite beams are presented in the paper, which deduces a common effect occurring to the composite beams under such loading conditions. Such effect of the composite beams is introduced to the design calculation of the deep foundation pits of opencut Metro stations. The application of such effect in the calculation of the deep foundation pits of Metro stations is analyzed and expatiated, with Industry Exhibition Center Station on line 2 of Shengyang Metro as project case. The paper can provide reference for similar designs in the future.