| 大断面小净距隧道围岩稳定性数值分析 大断面小净距隧道围岩稳定性数值分析 |
| |
| 引用本文： | 龚建伍,雷学文.大断面小净距隧道围岩稳定性数值分析 大断面小净距隧道围岩稳定性数值分析[J].岩土力学,2010,31(Z2):412-417. |
| |
| 作者姓名： | 龚建伍 雷学文 |
| |
| 作者单位： | 武汉科技大学 城市建设学院，武汉 430065 |
| |
| 基金项目： | 武汉科技大学青年基金资助项目(No. 2009xz32)。 |
| |
| 摘 要： | 结合小净距隧道工程特点，分别建立不同跨度小净距隧道有限元计算模型，对隧道施工过程力学特征及围岩稳定性进行对比分析，以研究三车道大断面小净距隧道区别于两车道小净距隧道的基本力学特征。分析结果表明，对应不同隧道跨度、隧道净距和围岩级别对隧道施工过程中围岩稳定性的影响有显著差别，相同隧道净距条件下，三车道小净距隧道围岩应力状态比两车道隧道差，净距越小，差别越大，而围岩质量越低，差别也越显著；另外，在质量较差的围岩中，大断面小净距隧道围岩受力最薄弱部位主要集中在岩柱雁形部，而两车道小净距隧道则为岩柱中部。研究结果可为大断面小净距隧道的设计、施工提供有益的参考。
|
| 关 键 词： | 大断面 小净距隧道 数值分析 围岩 稳定性 |
| 收稿时间： | 2010-08-02 |
Numerical analysis of stability of surrounding rock for large-section tunnels with small spacing |
| |
| GONG Jian-wu,LEI Xue-wen.Numerical analysis of stability of surrounding rock for large-section tunnels with small spacing[J].Rock and Soil Mechanics,2010,31(Z2):412-417. |
| |
| Authors: | GONG Jian-wu LEI Xue-wen |
| |
| Institution: | College of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China |
| |
| Abstract: | According to the characteristic of small spacing tunnels, the finite element models with various tunnel sections have been established. The comparative analyses of their surrounding rock stabilities during construction were made; and the basic mechanical characteristics of large-section twin tunnels with small spacing have been pointed out, which differs from that of two-lane twin tunnels. Analytical results show that the influence of tunnel spacing and rock grade on surrounding rock stability is dramatically different corresponding to various tunnel sections. Under the same condition of tunnel spacing, the mechanical state in three-lane twin tunnels is much more inferior to that of two-lane twin tunnels. Accordingly, the smaller the tunnel spacing, the worse the surrounding rock grade, and the more significant the difference. In addition, the worst position of mechanical state in large-section twin tunnels and small-section twin tunnels are the upper part and middle part of inter-space rock in weak surrounding rock, respectively. The results can be for reference in the design and construction of large-section twin tunnels with small spacing. |
| |
| Keywords: | large section small spacing tunnel numerical analysis surrounding rock stability |
|
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
