既有高边坡下深基坑支护设计与施工监测分析  

Supporting design and construction monitoring analysis of deep foundation pit under an existing high-steep slope

作　　者：戴文奎 熊智彪[1] 宫鹤[1] 王仁杰[1] 宋世豪 

机构地区：[1]南华大学城建学院,衡阳421001 [2]湖南核工业岩土工程勘察设计研究院,长沙410001

出　　处：《建筑结构》2013年第24期68-71,共4页Building Structure

摘　　要：某既有高陡边坡下深基坑采用了桩锚支护结构,介绍了支护结构设计。在基坑支护结构施工和开挖过程中,对支护结构位移、锚索拉力以及周边建筑物沉降进行了监测,并结合施工工况对监测数据进行了分析。分析结果表明:基坑顶支护结构的水平位移受基坑旁既有高边坡的影响,其与边坡的高度、基坑顶上的荷载大小有关;锚索拉力突然出现先降后升的异常现象,是锚索失效的征兆;基坑周边房屋沉降与距基坑的距离有关,邻近基坑一侧沉降大,远侧沉降小。最后介绍了当基坑周边房屋沉降过大而成为危房时所采用的加固措施。The pile-anchor supporting structure is applied in a deep foundation pit under an existing high-steep slope, and the desigu of the supporting structure was introduced. The displacement of the supporting structure, the tension of anchor rope, and the settlement of the surrounding buildings were monitored when the supporting structure of the excavation was being constructed and excavated. Combining construction state, the monitoring data was analyzed. The analysis results show that the horizontal displacement of the supporting structure at the top of the foundation pit is affected by the existing high-steep slope, its value is relative to height of the slope and the magnitude of load at the top of the foundation pit. It can be judged a symptom of the failure anchors that anchor cable tension suddenly appears abnormal phenomenon which decreases first and then increases. The settlement of the buildings surrounding the foundation pit is relative to the distance from the foundation pit, the settlement is large nearby the foundation pit and small far away from it. Reinfbrcement measures were introduced when the buildings surrounding the foundation become dangerous buildings due to too large settlement of tile buildings.

关 键 词：既有高边坡 深基坑 支护结构 监测 

分 类 号：TU473[建筑科学—结构工程]