系统锚杆对大断面隧道施工安全性的影响.pdf

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第 1 卷第 1 期地下空间与工程学报 Vol. 1

2005 年 02 月 Chinese Journal of Underground Space and Engineering Feb. 2005
文章编号:1673 0836 (2005) 01 0133 04
系统锚杆对大断面隧道施工安全性的影响
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2 李强, 王明年, 王玉锁
(1. 中交第一公路勘测设计研究院,西安 710075 ; 2. 西南交通大学地下工程系,成都 610031)
摘要:结合软弱围岩隧道工程地质和支护设计特点,应用三维数值方法模拟研究了软弱
围岩隧道系统锚杆在一次支护中的作用效果。研究结果表明,系统锚杆不仅可以大大降低一
次支护和二次支护结构的内力,提高结构的安全度,而且可以有效抑止隧道周边围岩的应力松
弛,改善周边围岩的受力特性,提高施工的安全性。
Ξ关键词: 系统锚杆; 大断面隧道; 三维数值方法
中图分类号:U455. 7 + 1 文献标识码:B
Influence of System Anchoring Bolt During Construction of
Large cross - section Tunnel
LI Qiang1 ,2 , WANG Ming nian2 ,WANG Yu suo2
(1. munications First Highway Survey Design and Research Institute , Xi’an 710075 , China ;
2. Dept. of Underground and Tunnel Engineering , Southwest Jiaotong University , Chengdou 610031 , China)
Abstract :According to the characteristics of engineering geology and supporting design in weak rock tunnel is simulat
ed , in this paper , the influence of system anchoring bolt during construction of large cross - section tunnel in weak rock by
three - dimension finite element analysis. The result shows that system anchoring bolt not only reduces the internal force of
primary support and secondary support , hence improves safety of the supporting structure ; but also effectively restricts relax
ation of surrounding rock , reinforces the surrounding ro