地铁双层隧道试验研究

The Research on Sole-hole Double Deck Tunnel of Subway

本文介绍了深圳地铁 1号线罗湖—大剧院段单洞双层矿山法隧道设计。认为在地质条件相对较好的情况下 ,采用重叠隧道设计可以减少对繁华市区建筑基础的影响。而单洞双层隧道较易保证施工安全和控制地表下沉量。先施工上洞比先施工下洞的地表沉降要小得多。开挖第二洞室时 ,先施工的衬砌有沿着两洞室中心线的连线方向上的卸载过程。卸载对非上下重叠隧道的衬砌不利。单洞双层隧道直墙部分所受拉力较大。单洞双层隧道直墙墙脚应加大拱脚。开挖前应进行围岩预加固 。

In this paper, the author introduces the sole hole double deck mountain method tunnel design of Shenzhen subway 1 line in the section from Luohu to Dajuyuan and thinks that it can reduce the influence on the building foundation in downtown areas. As for the sole hole double deck tunnel, it is easy to ensure construction safety and control the settlement of the earth′s surface. The settlement of constructing the super hole first is much smaller than constructing the sub hole first. When digging the second hole, the firstly constructed liner has an unloading process in the direction of the connecting line of the two holes′ centerline. Unloading is disadvantage to the lining of non double deck tunnel. The stress of the vertical wall of the sole hole double deck tunnel is great. The bottom arch foot of the sole hole double deck tunnel′s vertical wall should be increased. The surrounding rock should be pre enforced before digging. When fastening the arch loop, vertical anchor rod is necessary.