邻近运营地铁隧道的深基坑设计施工浅谈

Design and construction of deep foundation pits near metro tunnels

随着上海城市地下空间的开发利用,不可避免的会出现越来越多深基坑邻近运营的地铁隧道开挖施工。深基坑的开挖施工对周围环境影响大,特别是对地铁隧道这种特殊重大市政构筑物,更需要严格控制施工影响。本文以会德丰广场基坑为例,对位于地铁隧道一侧的挖深超过10 m以上,与隧道间距小于10 m的基坑设计、施工阶段采取的一些地铁保护措施进行浅析,为后续地铁安全保护区内的深、大基坑工程设计、施工提供参考。

There will have been 13 lines with more than 500 km in length for the rail transit in Shanghai by 2012.At the same time,the urban development involves the construction of underground space that requires deep foundation pits.As a consequence,researches on the influences of deep foundation pits on the existing neighboring tunnels have become an important task.Based on the foundation pit of Wheelock Square,some protection measures which should be considered during the design and construction period for protecting metro tunnels are introduced.It may be valuable for the foundation pits more than 10 m in depth and less than 10 m in length near tunnels.