（南华大学城市建设学院岩土工程系，衡阳 421001）

［摘要］某深基坑与周边建筑物距离近，对变形要求高，设计采用了人工挖孔桩与锚索相结合的支护结构。对锚索进行了检测与监测，同时对支护结构顶部水平位移进行了监测。结果分析表明，土层预应力锚索的抗拔承载力与土层和锚固体之间的界面摩阻力有直接的关系，同时与锚索的施工质量也密切相关，其破坏模式应当是注浆体与土层接触面发生剪切破坏。监测结果表明，基坑整体稳定，桩锚支护结构对变形起到了有效的控制作用。

［关键词］桩锚支护结构；设计；预应力锚索；测试

Design for pile-anchor retaining structure and testing and analysis of prestressed anchor rope

Xiong Zhibiao, Wang Qiyun, Gu Danping(Geotechnical Engineering Department, School of Urban Construction, University of South China, Hengyang 421001, China)

Abstract:Pile-anchor system was adopted as the retaining structure for the foundation pit, which was close to the surrounding buildings and the deformation should be rigorously controlled.Testing and monitoring for anchor rope and top horizontal displacement were carried out. The working performance of the earth-prestressed anchor rope had been analyzed, which indicated that the load carrying capacity of soil prestressed anchor rope was correlated with interface friction resistance between soil and anchorage body directly and closely related to constructing quality. The failure mode of prestressed anchor rope in the earth was actually caused by a shear force and the interface between the grounding and the earth layer. Monitoring results indicated that the pit was overall stable and pile-anchor system could control deformation of retaing structure effectively.

Keywords:pile-anchor retaining and protecting structure； design； prestressed anchor rope； testing

作者简介：熊智彪，副教授，Email:xzb1966@126.com。

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