| 大跨径隧道围岩的快速分级与稳定性分析 |
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| 引用本文： | 赵文忠,黄生文,刘丹.大跨径隧道围岩的快速分级与稳定性分析[J].地下空间与工程学报,2015,11(2):316-320. |
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| 作者姓名： | 赵文忠 黄生文 刘丹 |
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| 作者单位： | 1. 河北省高速公路邢汾管理处,河北 邢台 054009;2. 长沙理工大学 岩土工程研究所,长沙 410114 |
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| 基金项目： | 2012年河北省高速公路管理局科技创新项目 |
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| 摘 要： | 通过某高速公路大跨径隧道的现场实勘,采用BQ围岩分级和CSIR分类法对将要变更隧道段围岩快速动态分级,结果表明,围岩质量好于Ⅳ级但是比Ⅲ级稍差。采用赤平极射投影和实体比例投影法对本段隧道定性定量分析,结果印证拱顶不稳定结构体为可能塌落体积为44.4 m3斜四面锥体落石。对围岩位移与支护结构应力的数值分析结果亦表明最大位移出现在拱顶,两种分析结果相互印证。据此对施工隧道进行了设计变更和优化,获得了良好的效果。
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| 关 键 词： | 快速分级 稳定性 图解分析 地质评价 数值分析 |
| 收稿时间： | 2014-10-23 |
Rapid Classification and Stability Analysis of Surrounding Rock in Large-span Tunnel |
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| Zhao Wenzhong,Huang Shengwen,Liu Dan.Rapid Classification and Stability Analysis of Surrounding Rock in Large-span Tunnel[J].Chinese Journal of Underground Space and Engineering,2015,11(2):316-320. |
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| Authors: | Zhao Wenzhong Huang Shengwen Liu Dan |
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| Affiliation: | 1. Hebei Province Xingfen Expressway Management Department, Hebei 054009, P.R.China; 2. Institute of Geotechnical Engineering, Changsha University of Science and Technology, Changsha 410114, P.R.China |
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| Abstract: | A case study of rock mass rapid and dynamic classification is given for a large-span freeway tunnel using BQ and CSIR methods based on detailed geological surveying. The results show that the surrounding rock quality is in range between class Ⅲ and class Ⅳ. The application of stereographic projection and solid scale projection to the analysis on tunnel surrounding rock’s stability indicates that instability structure of vault is a possible collapsed oblique tetrahedron with a volume of 44.4 m3. The results of numerical analysis on surrounding rock displacement and stress of the supporting structure confirm that the maximum displacement occurs in the vault. It was proved practical that we could optimize and change design of the tunnel construction according to the analysis results. |
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| Keywords: | rapid classification stability graphical analysis geology analytical numerical analysis |
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