深基坑支护降水设计及变形监测分析

以兰州红楼广场深基坑工程为背景,通过方案优选,提出上部采用土钉墙、下部采用排桩预应力锚杆联合支护技术,设计了相应的现场监测方案,对该基坑开挖支护过程中桩顶水平位移及周边建筑物沉降进行监测,并对实测数据进行整理分析,得出深基坑开挖过程中桩锚支护结构水平位移及邻近建筑物的沉降规律。结果表明该联合支护体系是一种有效的支护技术,可为类似工程的支护设计提供有益参考。

Analysis on displacement and design of a deep excavation in Lanzhou area

Through plan optimization of a real project in Lanzhouarea,a combining supporting technology of the upper soil-nailing wall and the lower the row piles with pre-stress anchors is proposed.Taking the deep excavation of Lanzhou Hong- lou Building as the background,to make a field monitoring scheme, monitor the horizontal displacement of the pile top and the surrounding building settlement in the process of excavating,and analyze the measured value.Finally,get the law of the horizontal displacement of the pile-anchor retaining structure and the surrounding building settlement, and give pieces of advice on the deformation control of deep excavation.The results show that the combining supporting system is a kind of effective support technology,and it may provide reference for the supporting design of similar projects in Lanzhou area.