软土层大跨度半盖挖顺作法超宽地铁基坑放坡开挖施工技术

在地下管线错综复杂且毗邻高层建筑物的软土层超宽半盖挖顺作法地铁深基坑施工中,为确保深基坑围护结构和支撑体系的安全,必须要有科学、合理、完善的土方开挖施工技术方案。介绍无锡地铁2号线友谊路站半盖挖顺作法超宽基坑施工技术。工程实践证明,预留梯形挡埂作为土方运输便道和深基坑围护结构临时支撑体系,对这类软土层超宽深基坑进行放坡开挖是可行的,可为今后更多较为复杂的地下车站施工提供参考。

Research on the Long Span Half Cover Excavation Technology of Extra-wide Subway Foundation Pit Slope in the Soft Soil

In the ultra wide semi cover excavation of deep foundation pit of subway in soft soil with perplexing underground pipeline and adjacent high-rise buildings, to ensure the safety of retaining structure of deep foundation pit and the supporting system, there must be scientific, reasonable construction scheme to improve the earthwork excavation. This paper introduces the technology of the semi cover excavation method of super wide foundation pit construction technology of Friendship Road No. 2 line of Wuxi Metro Station. Practice shows that reservation of the trapezoidal barrier ridge as earthwork transportation road and retaining structure of deep foundation pit of temporary support system is feasible for the slope excavation of soft soil deep foundation pit of ultra width, which can provide reference for complex underground station construction.