暗挖双连拱隧道穿越浅基础高层楼群区施工技术

北京城市铁路东直门区间采用双连拱隧道结构形式 ,在富水松散地层中从两栋浅基础高层居民楼中间采用浅埋暗挖法通过 ,施工难度极大。本文主要阐述针对该段复杂的施工边界及约束条件 ,在处理地层与结构、隧道施工与既有建筑物相互作用 ,所采用的技术方法和特殊条件下的高层建筑防护技术 ,以及监测在施工中的应用 ,以期为今后类似工程的施工提供参考和借鉴。

CONSTRUCTION TECHNIQUE FOR SUBSURFACE EXCAVATION OF DOUBLE-HINGED ARCH TUNNEL CROSSING HIGH-RISE BUILDINGS AREA WITH SHALLOW FOUNDATION

The structure of double-hinged arch tunnel is adopted in Dongzhimen section on Beijing urban transit,for which the shallow buried subsurface excavation method was adopted in order to under cross two high-rise buildings with shaoolw foundation in water riching and loosening formation.This paper describes the used technical methods for treating the formation related to the structure,tunnel constuction and existing buildings and also describes the prevention technique for highrise-rise buildings and monitoring works in constuction,for reference to future similar works.