高地应力地下厂房预应力锚索预紧系数

doi:10.16285/j.rsm.2016.0751

›› 2018, Vol. 39 ›› Issue (3): 1002-1008.doi: 10.16285/j.rsm.2016.0751

高地应力地下厂房预应力锚索预紧系数

张建海^{1, 2}，王仁坤³，周钟³，郑路⁴，张茹^{1, 2}，谢和平^{1, 2}

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

收稿日期:2016-04-11 出版日期:2018-03-12 发布日期:2018-06-06
通讯作者: 郑路，男，1982年生，博士，副教授，主要从事岩土工程和地下工程的数值计算研究工作。E-mail: zhenglu8211@163.com E-mail:1057729757@qq.com
作者简介:张建海，男，1968年生，博士，教授，博士生导师，主要从事岩土工程和地下工程的理论和计算研究工作

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

ZHANG Jian-hai^{1, 2}, WANG Ren-kun³, ZHOU Zhong³, ZHENG Lu⁴, ZHANG Ru^{1, 2}, XIE He-ping^{1, 2}

1. College of Water Resources & Hydropower, Sichuan University, Chengdu, Sichuan 610065, China; 2. State Key Laboratory of Hydraulics and Mountain River and Protection Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 3. Chengdu Engineering Corporation Limited, PowerChina, Chengdu, Sichuan 610072, China; 4. Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, Sichuan 610065, China

Received:2016-04-11 Online:2018-03-12 Published:2018-06-06

摘要/Abstract

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。

关键词: 预紧系数, 高地应力, 地下厂房, 预应力锚索, 锦屏一级水电站

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.

Key words: pre-load factor, high geo-stress, underground powerhouse, anchor cable, Jinping-I hydro-power station

中图分类号:

TU 761.4

张建海，王仁坤，周钟，郑路，张茹，谢和平, . 高地应力地下厂房预应力锚索预紧系数[J]. , 2018, 39(3): 1002-1008.

ZHANG Jian-hai, WANG Ren-kun, ZHOU Zhong, ZHENG Lu, ZHANG Ru, XIE He-ping, . Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress[J]. , 2018, 39(3): 1002-1008.

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高地应力地下厂房预应力锚索预紧系数

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

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