一座洞室群立体交叉的明暗挖结合地铁车站的设计

以广州地铁5号线小北站为例，对线路两端或中间不具备明挖条件的地铁车站的修建，提出了“分离暗挖站厅隧道”的概念。通过将站厅隧道与站台隧道空间十字交叉布置，并竖向和斜向联通，构成了立体交叉洞室群结构，较好地实现了车站功能；阐述这种明暗挖结合车站的设计概念，介绍该站建筑、结构的施工设计，并对其复杂的结构设计难点进行了论述。最后，对类似环境下的车站设计提出了几点建议。

Design of a Metro Station Combined with Tunnels Crossing in Space and Constructed by Cut and Cover Method and Underground Excavation Method

  For the design of Metro stations that can not be constructed by cut and cover method on both ends or in the middle, the concept of "separate concourse tunnel constructed by underground excavation method" is proposed. On this basis, a well functioning station structure is designed, with the concourse tunnel crossing the platform tunnel in space and the concourse tunnel being connected with the platform tunnel in vertical direction and oblique direction. The design concept of stations constructed by cut and cover method and underground excavation method was presented. Firstly, the architecture and construction design of Xiaobei Metro station is introduced. Secondly, the key of this complicated structure design is discussed. And finally, some advices are made which can be referred to for some other projects with similar surrounding conditions.