小浪底排沙洞预应力环锚运行27年后锚固力检测与评价

刘焕虎; 谢宝丰; 史命; 黄卓; 孙兴松

doi:10.11988/ckyyb.20260341

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长江科学院院报 ›› 0 DOI: 10.11988/ckyyb.20260341

小浪底排沙洞预应力环锚运行27年后锚固力检测与评价

刘焕虎 ¹ ,
谢宝丰 ¹ ,
史命 ² ,
黄卓 ¹ ,
孙兴松 ²

作者信息 +

Field Detection and Assessment of Anchoring Force in Prestressed Ring Anchors of the Xiaolangdi Sediment Discharge Tunnel After 27 Years of Service

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摘要

水工隧洞无粘结预应力环锚的长期预应力保持能力是决定结构安全与服役寿命的关键指标。针对小浪底1号排沙洞预应力衬砌服役27年后环锚实际锚固力水平问题，选取第9、第10试验块各1束预应力环锚作为研究对象，开展现场反张拉检测。针对预应力衬砌环锚埋设空间受限、锚具槽封闭性要求高及传统锚索检测方法适应性不足等问题，设计了一种适用于水工隧洞预应力衬砌的环锚锚固力反张拉检测结构，并提出了相应的检测方法和实施步骤。该检测结构通过偏转器改变加载路径，在有限锚具槽空间内实现反张拉加载，并兼顾了对原锚具槽及密封结构的保护，具有较强的现场适应性。据此完成2束环锚的现场测试。检测结果表明，所设计的反张拉检测结构能够满足现场安装、加载及锚固力检测要求，检测过程顺利实施；试验段环锚服役27年后的锚固力为锁定值的91.27%~117.03%，平均为104.72%，整体接近或高于设计水平，未见明显衰减。结果说明，反张拉法可用于预应力衬砌环锚锚固力的检测，小浪底1号排沙洞试验段环锚预应力保持状态正常，衬砌结构长期服役性能总体稳定。

Abstract

The long-term prestress retention capacity of prestressed ring anchors in hydraulic tunnels is a key indicator determining structural safety and service life. To detect the anchorage force of ring anchors in the prestressed lining of No. 1 sediment discharge tunnel at Xiaolangdi after 27 years of service, two prestressed ring anchors from Test Blocks 9 and 10 were selected for in-situ lift-off testing. To address the limited installation space for ring anchors in prestressed linings, the high sealing requirements of anchor slot, and the poor adaptability of conventional anchor-cable testing methods, a lift-off testing system suitable for ring-anchor anchorage-force measurement in prestressed hydraulic tunnel linings was developed, and the corresponding testing procedure was established. The testing system uses a deviator to change the loading path, enabling lift-off loading within the limited space of the anchor groove while also protecting the original anchor groove and sealing structure, thus offering strong field adaptability. Field tests on two ring anchors were successfully completed. The results showed that the proposed system satisfied the requirements for field installation, loading, and anchorage-force measurement. The measured anchorage force after 27 years ranged from 91.27% to 117.03% of the locked force, with an average of 104.72%, indicating no obvious reduction and an overall level close to the design value. The study demonstrated that the lift-off method was applicable to anchorage-force assessment of prestressed lining ring anchors, and that the long-term service performance of the lining remains stable.

导出引用

刘焕虎, 谢宝丰, 史命, 等. 小浪底排沙洞预应力环锚运行27年后锚固力检测与评价[J]. 长江科学院院报. 0 https://doi.org/10.11988/ckyyb.20260341

LIU Huan-hu, XIE Bao-feng, SHI Ming, et al. Field Detection and Assessment of Anchoring Force in Prestressed Ring Anchors of the Xiaolangdi Sediment Discharge Tunnel After 27 Years of Service[J]. Journal of Changjiang River Scientific Research Institute. 0 https://doi.org/10.11988/ckyyb.20260341

中图分类号： TV65

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