复杂地质条件下暗挖施工应急处置技术措施

APPLICATION OF EMERGENCY MEASURES IN CONSTRUCTION OF UNDERGROUND EXCAVATION UNDER COMPLEX GEOLOGICAL CONDITIONS

北京市轨道交通首都机场线二期(西延)工程土建施工项目为北京市首个全部采用不降水且在饱和微承压砂(透镜体不良)层施工的暗挖工程,车站及区间大部分土建结构以人工暗挖施工为主。为防止暗挖施工现场发生渗水坍塌安全事故,并完善事故应急处置工作机制,根据施工现场环境情况,按不同情况类别制订了不同级别的应急处置系统措施,预防了暗挖施工可能发生的坍塌事故。

Beijing rail transit Capital Airport Line phase II(west extension)civil work construction project was the first subsurface excavation project in Beijing carried out in saturated micro-pressure sand(lens body adverse)stratum without dewatering.Most civil work structures of station and interval were excavated mainly by manual mining excavation.To avoid water seepage and collapse of subsurface excavation site and to realize effective accident emergency treatment mechanism,different levels of systematic emergency treatment measures were prepared according to the ambient conditions at construction site,to prevent the collapse accident during subsurface excavation construction.