大尺寸开洞结构的简化平面应变模型的分析和探讨

在轨道交通建设中,结构设计方案常涉及到大尺寸开洞结构的受力问题,如盾构施工竖井、轨排工作井等。本文以轨排井为例,采取合理的假设条件,将轨排井洞口纵梁的弯曲刚度转化为该点处的等效弹性支点刚度,建立简化的平面应变模型,进行结构受力分析和结构设计。通过与空间板壳模型进行对比分析,表明此类大尺寸开洞结构的简化平面应变模型是合理可行的,为类似工程设计提供了一定的参考和依据。

The Analysis and Discussion about Simplified Plane-strain Model for the Structure with a Large-size Hole

In rail transit construction, the design problem of structure with large-size hole is often involved, such as shield shafts, pile-group support wells. With reasonable assumptions, bending stiffness of pile-group support well＇s beam is turned to equivalent-elastic-supporting stiffness in this paper, and a simplified plane-strain model is established for structural stress analysis and design. According to the comparison with the result of space-shell mode, it is show that the model is reasonable and feasible for those structures with large-size hole. It is available for future reference and provides a basis for such design.