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
