Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress

ZHANG Jian-hai; WANG Ren-kun; ZHOU Zhong; ZHENG Lu; ZHANG Ru; XIE He-ping

doi:10.16285/j.rsm.2016.0751

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Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress

更新时间：2026-06-25

- Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress
- Vol. 39, Issue 3, Pages: 1002-1008(2018)
- 作者机构：
  
  1. 四川大学水利水电学院,四川,成都,610065
  2. 四川大学水力学及山区河流开发与保护国家重点实验室,四川,成都,610065
  3. 中国电建成都勘测设计研究院有限公司,四川,成都,610072
  4. 四川大学灾后重建与管理学院,四川,成都,610065
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.0751
  CLC： TU761.4
- Online First：06 June 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Jian-hai, WANG Ren-kun, ZHOU Zhong, et al. Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress[J]. 2018, 39(3): 1002-1008.
DOI：

ZHANG Jian-hai, WANG Ren-kun, ZHOU Zhong, et al. Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress[J]. 2018, 39(3): 1002-1008. DOI： 10.16285/j.rsm.2016.0751.

摘要

为了有效控制围岩大变形，避免围岩破坏，常常对围岩变形突出的高边墙、洞室交叉口区域采用预应力锚索加固。目前，对于具有时效变形特征的高地应力、低强度应力比的地下厂房锚索预紧力相关研究尚较少报道。以锦屏一级水电站地下厂房为代表的高地应力地下厂房，在围岩开挖过程中表现出显著的时效变形特征，从而导致锚索、锚杆内力持续增加，甚至内力超出强度极限而破坏。为合理设置锚索预紧力，基于围岩时效变形特征，提出了围岩时效释放荷载计算方法，并推导了预应力锚索预紧系数计算公式。该公式可以解释不同地应力环境以及不同支护强度、不同施锚时间对锚索预紧力的影响。与锦屏一级地下厂房锚索预紧系数实际采用值对比分析可见，所提出的预紧系数公式较为合理，具有工程实践指导作用。

Abstract

To avoid the damage of surrounding rock

pre-stressed anchor cables are installed in high side-wall and cavern intersection area to control the large deformation of surrounding rock. However

research is seldom performed on estimating the pre-load of cables in underground powerhouse with high geo-stress and low strength-stress ratio in the previous literature. Jinping-I hydro-power station is recognised as a typical high geo-stress underground powerhouse. Its cavern exhibits remarkable time-dependent deformation during excavation

which may result in the continuous increase of the inner force of the anchor cable and bars

even the strength failure. To determine an appropriate pre-load

a procedure is proposed for calculating the time-dependent released load of surrounding rock

based on their deformation characteristics. At the same time

a formula is deduced to calculate the pre-load factor of pre-stressed anchor cable. This established formula considers the influences of geo-stress

anchorage force and installation time on the pre-load factor. Comparing the actual values with the theoretical values of pre-load factor of Jinping-I underground powerhouse

the result indicates that the established calculation formula for the pre-load factor is reasonable and can be referenced in practical underground engineering.

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