天津临港造修船基地坞首基坑开挖施工技术

Construction technique of foundation pit for dockhead in Tianjin port ship building-repairing base

天津临港造修船基地场区地质条件差,承压水头高,坞首基坑开挖最深达18.2 m,属一级基坑。介绍了该工程坞首基坑稳定性验算情况和坞首基坑开挖实施步骤。工程实践证明,在深基坑工程中采用高施工面送桩、深井降水和分块小范围开挖并及时施工上部结构的施工工艺对抵抗突涌是有效的,可供类似工程施工借鉴。

The foundation of Tianjin harbor building-repairing base is unstable,the pressure head is high,and the excavation depth of the dockhead reaches 18.2m.This paper describes the stability analysis and excavation implementation of the foundation pit for the dockhead.The practice proves that it is effective to adopt higher construction surface pile follower,dewatering of foundation pits,pieced small-area excavation and timely construction of the upper structure.It may serve as a reference for similar projects.