期刊论文

Xiong, Z.-B.(xzb1966@126.com)

中文

采矿与安全工程学报

1673-3363

2009

26

1

123-126

10.3969/j.issn.1673-3363.2009.01.025

湖南省建设厅科技项目（2007-4）；

本校为第一且通讯机构

为了解深基坑桩锚支护结构锚索的工作性能,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轴力监测.检测与监测成果的分析表明,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;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.在损失阶段,二次张拉锁定后的锚索预应力损失在10%以内.在变化阶段,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.

To understand the performance of anchor rope of pile-anchor retaining structure in deep foundation pit, we tested and monitored the anti-pulling capacity and monitored the axial tension for prestressed soil anchor rope. The result shows that regarding the limit friction resistance between anchorage and soil as a constant in calculating the anti-pulling force is unreasonable. Variation of axial load of anchor rope has three phases: Prestressed loss, variation in axial force, and stabilization according to the monitoring and analysis. Prestressed loss of anchor rope is less than 10% after second...