广州地铁二号线大跨度段位于公园前站至纪念堂站区间中部 ,开挖跨度达 2 1 6m ,该区段围岩软弱 ,且埋深较浅。针对该段结构设计情况 ,对隧道结构与地层在开挖过程中发生的非浅性变形特性进行计算 ,并详细介绍了大跨度段的施工情况。经过监控量测可知 ,采用双侧壁方法施工大跨度隧道 ,可有效控制地表沉降和洞室变形 The long-span section of Guangzhou Metro Line 2 is located in the middle of the interval from Park Station to Memorial Station, with an excavation span of 21 6 m. The surrounding rock of this section is weak and has a shallow buried depth. According to the structural design of this section, the non-shallow deformation characteristics of the tunnel structure and strata during excavation are calculated, and the construction of the large-span section is introduced in detail. After monitoring the measurement shows that the use of double-sided wall construction method of long-span tunnel can effectively control the surface settlement and deformation of the cavern