望京A1-C-4~#地基坑工程锚杆拉力监测研究  

Monitoring and Study for Anchor Tension of Deep Excavation Engineering of Wangjing Al-C-4~# Project

作　　者：张钦喜[1] 刘新[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《岩土工程技术》2014年第5期227-231,共5页Geotechnical Engineering Technique

基　　金：国家自然科学基金项目(50678003)资助

摘　　要：在北京地区深基坑工程是比较常见的,目前深基坑工程相关的监测和理论研究不太成熟。通过对望京A1区C组团4#地项目基坑支护工程中锚杆拉力的监测研究,可知:本工程极具特点,两排锚杆的拉力变化趋势截然相反,在一定程度上反映出现行规范的不尽详细之处,也反映了基坑工程较强的地域特点;工程中应加入桩身位移监测,既保证工程安全,又提供详细数据进行设计优化和减少造价、工期;建议今后有新进场施工的张拉机具时,先采用锚杆轴力计对其锁定时的预应力损失进行量化,并以此为依据适当优化施工参数;由此可知目前的基坑工程存在很大的优化空间。研究结论也可为类似工程设计提供参考和依据。Deep excavated foundation engineering is common in Beijing area, while the related monitoring and theoretical researches are not quite sound. Through the monitoring and research on bolt pulling force in the supporting project of founda- tion pit at Land No. 4 Group C, Wangjing Al District, it is deducible that the project is quite distinctive as the pulling force changing tendency of the two lines of bolts are opposite. That reflects in some degree the incompleteness of the current regula- tions and the strong geographical characteristics of excavation projects. Pile body＇s displacement monitoring should be intro- duced to projects so to ensure their safety and to provide detailed data for design optimization and cost reduction. It＇s recom- mended that when pulling machinery in construction is available, axial force meter of bolt should be used firstly to quantify the pre-stressing loss locked, and optimize the construction parameter properly in accordance. Therefore, it follows that there ex- ists vast room for optimization for the current excavated foundation engineering. The research result could also provide refer- ence and foundation for similar engineering design.

关 键 词：深基坑工程 桩锚支护 锚杆拉力 监测研究 

分 类 号：TU47[建筑科学—结构工程]