深基坑桩锚支护结构中锚索检测与监测分析  

Inspection and Monitoring Analysis for Anchor Rope of Pile-anchor Retaining Structure in deep Foundation Pit

作　　者：熊智彪[1] 刘小峰 王启云[1] 谷淡平[1] 

机构地区：[1]南华大学城市建设学院,湖南衡阳421001 [2]衡阳市吉隆城建检测有限公司,湖南衡阳421001

出　　处：《矿冶工程》2009年第3期8-10,15,共4页Mining and Metallurgical Engineering

基　　金：湖南省建设厅2007年度科技项目(编号:4)

摘　　要：对某深基坑桩锚支护结构中土层预应力锚索进行了抗拔检测与张拉监测,结合这些检测与监测成果,对锚索的抗拔力以及张拉锁定后的轴力变化进行了分析。检测分析认为,将锚固体与土体之间的极限摩阻力视为定值并假定其沿锚固体侧面均布计算抗拔承载力是不合理的。监测及分析表明,开挖过程中的轴力变化可分为预应力损失阶段、轴力变化阶段和稳定阶段。在预应力损失阶段,二次张拉锁定后的锚索预应力损失在10%以内。在轴力变化阶段,轴力可能减少,也可能增大,曲线呈波动形状。基坑变形稳定后,轴力也将稳定。稳定后的轴力与初始锁定值比较,初始值较大的锚索轴力变化较小,初始值较小的锚索轴力变化较大。Pulling resistance inspecting and stretching monitoring are carried out for the pre-stressed soil anchor rope of a deep foundation pit. The pulling resistance and variation of axial load of anchor rope after stretch locking are analyzed combining with the inspecting and monitoring results. The analysis of inspection shows that it is unreasonable to the limit friction resistance between anchor and rock mass as the side of anchor while calculating pulling-resistance. The regard a fixed value and assume it uniform distribution along with monitoring and analysis results show that the variation of axial load can be divided into three phases during the excavation, including pre-stressed loss, variation of axial load and stabilization phase. During the phase of pre-stressed loss, pre-stress loss of anchor rope is less than 10% after secondary stretch locking. During the variation of axial load, But the axial load will be stable as the deformation for anchor with larger initial stretch locking value, axial load may increase or decrease, producing a fluctuating curve. of foundation pit is stable. It is found that the axial load changes less and vice versa.

关 键 词：桩锚支护结构 锚索 抗拔检测 轴力监测 

分 类 号：TU476[建筑科学—结构工程]