Field experimental investigation on prestress loss law of anchor cable in foundation pits

YU Yu; LIU Xin-rong; LIU Yong-quan

doi:10.16285/j.rsm.2018.0013

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Field experimental investigation on prestress loss law of anchor cable in foundation pits

更新时间：2026-06-25

- Field experimental investigation on prestress loss law of anchor cable in foundation pits
- Vol. 40, Issue 5, Pages: 1932-1939(2019)
- 作者机构：
  
  1. 重庆大学土木工程学院
  2. 重庆大学山地城镇建设与新技术教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0013
  CLC： TU473
- Published：2019
- 稿件说明：
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[1]余瑜,刘新荣,刘永权.基坑锚索预应力损失规律现场试验研究[J].岩土力学,2019,40(05):1932-1939.

YU Yu, LIU Xin-rong, LIU Yong-quan. Field experimental investigation on prestress loss law of anchor cable in foundation pits[J]. 2019, 40(5): 1932-1939.
[1]余瑜,刘新荣,刘永权.基坑锚索预应力损失规律现场试验研究[J].岩土力学,2019,40(05):1932-1939. DOI： 10.16285/j.rsm.2018.0013.

YU Yu, LIU Xin-rong, LIU Yong-quan. Field experimental investigation on prestress loss law of anchor cable in foundation pits[J]. 2019, 40(5): 1932-1939. DOI： 10.16285/j.rsm.2018.0013.

摘要

受开挖施工及锚固地层的影响

基坑锚索预应力损失现象较为普遍。依托某实际工程开展现场试验

分析了张拉荷载大小、张拉锁定方式、无黏结段长度以及循环加载对锚索预应力损失产生的影响

进而对基坑锚索预应力损失形成机制进行了探讨。结果表明:锚索锚固体与周围地层发生的脱黏滑移是产生预应力损失的重要原因

锚拉力越大

锚索预应力损失越明显;对于分散型锚索

单根张拉锁定有利于减少其预应力损失;锚索无黏结段长度会对锚头刚度产生影响

其长度越短

锚索预应力损失越明显;多次循环加载可以将锚固体受荷产生的塑性变形进一步锁定

从而大大降低锚索在锁定后的预应力损失。相关规律和结论可为基坑锚索的设计与施工提供有益的参考。

Abstract

The occurrence of the prestress loss of anchor cable is more commonly encountered in foundation pit due to the influences of the excavation and strength of the stratum. Field tests were carried out in a practical project to analyze the effects of the tension load

tension locking mode

length of unbonded segment and cyclic loading on the prestress loss of anchor cable. The occurrence mechanism of the prestressed loss of the anchor cable was discussed. The results show that the debonding slip between the anchored solid and the surrounding stratum is an important reason for the prestress loss. A greater anchor force will induce more substantial loss of the prestress. As for the dispersed anchor cables

single tension locking is beneficial for minimizing the prestress loss. The length of the unbonded segment has an effect on the stiffness of the anchor head:a shorter length of the unbonded segment will result in more substantial loss of the prestress. Furthermore

it is found that the plastic deformation of the anchorage will be further locked under more times of cyclic loadings

which as a result reduces the loss of the prestress. The relevant rules and conclusions can provide useful references for the design and construction of the foundation pit anchorage cable.

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