软土基坑桩锚支护失效案例及处理措施分析  

Failure Case Study and Treatment Measures of Pile Anchor Supporting Structure Under Soft Soil Foundation Excavation

作　　者：葛阳成 朱进军[2] 邵勇[2] 

机构地区：[1]连云港市建设施工图审查中心,江苏连云港222006 [2]连云港职业技术学院建筑工程学院,江苏连云港222006

出　　处：《施工技术》2016年第1期20-23,共4页Construction Technology

基　　金：江苏省建设系统科技项目(2015ZD37);住房和城乡建设部科技计划项目(2015-K3-023);江苏省"六大人才高峰"高层次人才资助项目(2014-JZ-016)

摘　　要：某软土基坑采用桩锚支护结构,在基坑开挖完毕后坑体变形突然增至数十厘米,随后经过坑底处砂袋堆载和钢管支撑使得工程顺利完成。通过现场监测数据分析,认为其原因一是施工速度过快,使得变形无法收敛,二是软土中桩锚支护结构容易发生转动,特别是在锚索锚固角度较大和桩体嵌固深度较浅时,因此在软土基坑中采用桩锚支护结构应加强设计,如减小锚固角度、增大桩长等。A soft soil foundation excavation using retaining structure of pile and anchor, after the completion of excavation,foundation excavation deformation suddenly increased to tens of centimeters,and then the projects successfully completed with the sandbags heap the bottom and steel supporting.Through analysis of field monitoring data,one of reasons is fast construction,so that deformation can＇t converge,and the other one is in the soft soil,pile anchor retaining structure is prone to rotate,especially in the larger angle of anchorage and pile embedded depth is shallow,so the use of pile anchor retaining structure in soft soil foundation should strengthen the design,such as reducing the angle of anchor,increasing pile length and so on.

关 键 词：基坑 软土 支护 失稳 处理措施 

分 类 号：TU753[建筑科学—建筑技术科学]