地铁浅埋群洞施工工序与关键技术摘 要 广州地铁 2 号线越秀公园站车站中部为暗挖分离式、假岛式站台,两端为明挖 3 层结构,站厅层和站台层采纳斜通道相接,结构型式独特。利用明挖段作为暗挖的施工作业面,施工的转换复杂、工序多。暗挖隧道为浅埋、大跨、动载以及在软弱地层条件下修建的群洞,施工条件困难。提出了群洞施工的合理工序。施工的关键技术是减小对夹持土体的扰动以及对土体的加固,可实行拱部长管棚超前支护、中间土体进行注浆加固、设置锁脚锚杆或加大拱脚喷混凝土厚度等方法。关键词 地铁, 浅埋隧道, 暗挖,“中隔壁加台阶”工法, 管棚支护, 超前支护中图分类号 U 455. 49 The Working Procedure and Key Technology in Construction of Metro Tunnel Groups Yang Hongshe Abstract In the construction of Yuexiu Park Station of Guangzhou Metro Line 2 , the separate subsurface excavation technique is adopted ,the middle platform takes a false island structure with both endsopen2cut ,and the station hall is accessi2 ble to the platform layer through an inclined path. Because of the complicated working procedure ,this paper argues that the key technology in the subsurface excavation is to avoid disturb2 ing the tunnel body and to strengthen the platform layer by us2 ing pipe2shed support and advance support. Keywords metro , shallow tunnel , subsurface excavation , “CRD”excavating method , pipe2shed support , advance support Author’s address Item Branch of 2nd Co. ,Ltd. ,China Rail2 way Tunnel Groups,26400,Yantai,China 1 工程概况1. 1 站址周边环境广州地铁 2 号线越秀公园站长 275.8 m, 位于解放北路与流花路交叉路口下,起于以太广场前,沿解放北路并与之小角度斜交,止于广州体育馆东南边的锦汉车站停车场,大致呈南北走向。车站周围·70 ·的地面建筑主要以高档宾馆、公共建筑为主。地下管线主要有电缆线、煤气管、电信管廊、排水管、给水管、变压电缆(220 kV) ,埋深在 1. 0～1.5 m 之间。工程区域内的解放北路与流花路均是广州市交通繁忙的主干道,其中解放北路现有路面宽 35～40 m, 流花路现...
