桩锚式支护体系在地铁超大深基坑中的应用  

Application of Pile Anchor Support System in Super Large Deep Foundation Pit of Subway

作　　者：张伯夷[1] 杨泳森 Boyi Zhang;Yongsen Yang(China Water Resources and Hydropower Seventh Engmeering Bureau Chengdu Hydropower Construction Engmeering Co., Ltd., Chengdu, Sichuan, 161130, China)

机构地区：[1]中国水利水电第七工程局成都水电建设工程有限公司,中国四川成都611130

出　　处：《工程技术与管理（新加坡）》2018年第8期614-617,共4页Engineering Technology & Management

摘　　要：本课题以总面积约为482×20m^2、最大开挖深度为17m的基坑工程为依托,从设计、施工、监测等方面,分别对基坑开挖过程中和不同工况下桩锚式支护体系的受力进行计算分析和监测。结果表明:(1)随着各阶段基坑的开挖,围护桩外侧桩身应力呈拉-压-拉变化,内侧桩身应力呈压-拉变化,桩身应力变化主要受基坑开挖时间和预应力锚杆的张拉锁定等因素的彩响;(2)根据监测数据反馈分析,在桩锚式支护体系运用后,基坑围护结构变形值、地表沉降值、周边建构筑物变形值均在尤许值范SI内。This project relies on the foundation pit engineering with a total area of about 482×20m^2 and a maximum excavation depth of 17m. From design, construction andmonitoring, the calculation and analysis ofthe stress of the pile anchor support system during the excavation process and under different working conditions are carried out, the results show that:(l) With the excavation off bundation pits at various stages, the pile body stress on the outer side ofthe retaining pile is tensile-pressure-pull, and the stress on the inner pile is pressure-pull. The stress variation of the pile body is mainly affected by factors such as the excavation time ofthe foundation pitand the tension locking of the pre-stressed anchor;(2) According to the feed back analysis of the monitoring data, after the pile-anchor support system is applied, the deformation value ofthe fandationpit retaining structure, the surfece settlement value, and the defomiation value ofthe surrounding building structure are all with in the allowable value range.

关 键 词：地铁超大深基坑 桩锚式支护体系 桩身应力 

分 类 号：TU473.5[建筑科学—结构工程]