北京国贸三期A阶段基坑支护设计与施工监测.pdf

施工技术 2011年12月下 26 CONSTRUCTION TECHNOLOGY 第40卷第355期 北京国贸三期A阶段基坑支护设计与施工监测 马昕，周予启 (中建一局集团建设发展有限公司，北京100102) [摘要]北京国贸三期A阶段主塔楼建筑高度330m.基坑开挖深度-22.55m(最深-27.10m).根据地质条件， 大面采用上部土钉墙下部桩错联合的基坑支护结构形式，护坡桩间设高压旋喷形成止水帷幕体系.基坑施工过 程中，对支护结构水平位移、沉降、护坡桩倾斜、地下水位、锚杆拉力等进行监测.现场监测表明：围护结构和周边 环境的变形均在允许范围内，并针对监测结果提出改进措施. [关键词]地下工程；深基坑；桩错支护；监测 [中图分类号]TU470.3 [文献标识码]A [文章编号]1002-8498(2011)24-0026-04 Design and Construction Monitoring of Foundation Excavation Supporting in A Stage of Beijing World Trade Center Three Phase Ma Xin Zhou Yuqi China Construction First Division Group Construction Development Co.Lid.Beijing 100102 China) Abstract:The architectural height of A stage main building is 330m for the three phase project of Beijing World Trade Center.The depth of foundation excavation is -22.55m the deepest point is -27.10m). According to geological conditions soil nailing wall pounding with pile and anchors are designed as supporting structure and high-pressure jet grouting technology is adopted among the supporting piles to form waterproof curtain.During construction some control parameters are monitored including the ..horizontal displacement settlement inclining of supporting piles groundwater level and anchor stress. The monitoring results show that the displacement can meet the requirements and improving measures are suggested according to the monitoring values. Key words:underground;deep foundation excavation;pile-anchor supporting;monitoring 1工程概况 54和55层设8个2层高伸臂桁架形成结构转换 北京国贸三期A阶段工程坐落于北京市朝阳 层.周...