北京某深基坑桩锚支护结构监测及分析
摘要:采用桩锚支护结构对北京某深基坑进行支护,在施工过程中进行桩顶位移、地表沉降、锚索轴力监测,并对监测数据分析。结果表明:桩锚支护体系能有效地控制基坑水平位移和周边地表沉降,并且桩顶水平位移变化、沉降变化是比较有规律的。锚索预应力损失值较大,在30%～50%之间,在开挖过程中变化范围在15%以内;第一道锚索在控制位移和沉降发挥着关键的作用,第三道锚索是控制桩身最大弯矩的关键。结合实测值与理论计算值产生差异的原因,对以后类似桩锚支护结构的设计提出了建议。
Abstract:Based on supporting a deep foundation pit by adopting pile-anchor retaining structure.During the constrction,the displacement of pile head,the surface settlement,the axial load of anchor rope are monitored and analyzes the main monitoring data.The results indicate that the pile-anchor retaining structure can control the horizontal displacement of foundation pit and the surface settlement of surrounding structure effectively,and there are some laws in variation of horizontal displacemen and surface settlement.The losses of prestresses of anchors is large,it's about 30%~50%,and the range of variation is about 15% during the constrction;the first anchor rope play an important role in controlling displacement and settlement,the third anchor rope is the key of controlling the maximum bending moment in pile.Giving advice for the design of similar pile-anchor retaining structure combine with the reasons of the calculating data different from the measuring data.
中文标题：
北京某深基坑桩锚支护结构监测及分析
Monitoring and Analysis of Pile-anchor Retaining Structure for a Deep Foundation Pit in Beijing
作者：
周宸,李旭东,孙愿平
Zhou Chen,Li Xudong,Sun Yuanping
作者简介:周宸,1984年生,男,汉族,重庆市云阳县人,硕士。E-mail:zchen117@126.com
通讯地址：
中兵勘察设计研究院, 北京 100053
ChinaOrdnanceIndustrySurvey,Design&ResearchInstitute,Beijing100053,China
中图分类号:TU433
doi:10.3969/j.issn.1007-2993.2011.01.006
出版物：岩土工程技术
收稿日期:2010-10-21
关键词:基坑监测,桩顶位移,地面沉降,锚索轴力
Key words:foundation pit monitoring,displacement of pile head,surface settlement,axial load of anchor rope
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