某超深基坑组合支护体系上部土钉墙内力监测及分析  

Stress monitoring and analysis on upper soil nailing of super deep foundation pit with composite retaining system

作　　者：张志平 程学军 

机构地区：[1]中建国际建设有限公司,北京100125

出　　处：《建筑结构》2011年第10期105-106,94,共3页Building Structure

摘　　要：组合支护体系由上部土钉墙和下部锚拉桩(墙)结构联合形成,北京城区超过15m深的基坑越来越多地采用这种支护体系。以开挖深度约22m的北京侨福花园广场深基坑工程为例,分析了上部土钉墙在基坑开挖各阶段的内力变化规律,在开挖至土钉墙底时,土钉内力增长速率最快,当基坑潜在滑裂面超过土钉墙末端时,进一步的开挖对土钉内力增长影响有限;由于预应力锚杆的存在,减小了基坑坡顶的位移,同时土钉内力比设计值要小很多,今后类似工程设计可以减小土钉杆体直径。The composite retaining system is composed by soil nailing wall on the upper side and piles（or diaphragm walls） supported by anchor on the lower side.Nowadays,such system has been applied more and more in project excavated deeper than 15m in Beijing.Taking Qiaofu Plaza project with its excavation depth about 22m as an example,the soil nailing force on the upper side of this system was monitored and analyzed.The results show that the force grows fastest when excavated to the bottom of soil nailing wall.When the potential slide line is over the end of soil nailing wall,the force grows slowly to stable.Anchor with pre-stress reduces the horizontal displacement of the foundation pit,meanwhile,the force of soil nailing is little,so the diameter of steel bar in soil nailing wall can be reduced in similar engineering.

关 键 词：组合支护体系 基坑 土钉墙 锚拉桩(墙) 土钉内力 监测 

分 类 号：TU753.1[建筑科学—建筑技术科学]