| 隧道支护结构中锚杆的功效分析 |
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| 引用本文： | 郭小红,王梦恕.隧道支护结构中锚杆的功效分析[J].岩土力学,2007,28(10):2234-2239. |
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| 作者姓名： | 郭小红 王梦恕 |
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| 作者单位： | 1. 中交第二公路勘察设计研究院,武汉,430052;北京交通大学,北京,100000
2. 北京交通大学,北京,100000 |
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| 基金项目： | 交通部西部交通建设科技项目 |
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| 摘 要： | 分析了不同地质条件下的锚杆作用效应、锚杆抗拔力及其主要影响因素,同时根据锚杆承载拱理论给出了计算系统锚杆承载能力的计算方法,应用该方法分析了隧道在不同地质条件下各类支护型式的承载能力及其费效比,得到了系统锚杆在相对破碎的岩层中对洞室稳定的作用较大,随着地质条件变差,系统锚杆的费效比大幅度降低的认识。结合大量工程设计与施工方面的实践经验,经过系统分析后得到如下结论:在软弱围岩条件下不宜大量使用密集布置的系统锚杆,此时应以采用少量的、带注浆功能的、疏而长的锚管为主,可以充分发挥其稳定初期支护的作用。
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| 关 键 词： | 隧道 锚杆 承载能力 软弱围岩 |
| 文章编号： | 1000-7598-（2007）00-2234-06 |
| 收稿时间： | 2006-09-07 |
| 修稿时间： | 2006-09-07 |
Analysis of efficacy of rock bolt for tunnel support stucture |
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| GUO Xiao-hong,WANG Meng-shu.Analysis of efficacy of rock bolt for tunnel support stucture[J].Rock and Soil Mechanics,2007,28(10):2234-2239. |
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| Authors: | GUO Xiao-hong WANG Meng-shu |
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| Institution: | 1. China Communications 2nd Highway Survey Design and Research Institute, Wuhan 430052, China; 2. Beijing Jiaotong University, Beijing 100000, China |
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| Abstract: | Anchor effects,pullout strength and corresponding main influential factors are studied under different geological conditions.Based on anchor bearing arch theory,a calculation method of system anchors bearing capacity is proposed and applied to analyzing the bearing capacity of different support types under different geological environments.Cost-effectiveness ratio is also compared.Result from the analysis is that: system anchors play an important effect in the surrounding rock mass;and the cost-effectiveness ratio decreases greatly as the geological condition deteriorates.Combined with several engineerings design and construction,conclusions can be drawn that few and long grouted anchors should be used instead of frequent system anchors in soft rock mass for better stabilizing the early supports. |
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| Keywords: | tunnel anchor bearing capacity soft surrounding rock mass |
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