| 曲率半径对临时支护及核心土的受力影响分析 |
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| 引用本文： | 曲海锋,朱合华,蔡永昌.曲率半径对临时支护及核心土的受力影响分析[J].岩土力学,2008,29(7):1778-1782. |
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| 作者姓名： | 曲海锋 朱合华 蔡永昌 |
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| 作者单位： | 1.同济大学 地下建筑与工程系，上海 200092；2.上海投资咨询公司，上海 200003；3.同济大学 岩土工程重点实验室，上海 200092 |
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| 摘 要： | 双侧壁导坑方法开挖面积小，能够将大断面隧道简化为几个小跨度的导洞隧道，增加了隧道的整体稳定性，是特大断面大跨度公路隧道推荐采用的开挖方法之一。但目前并没有统一标准的双侧壁导坑断面的设计方法，核心土临时支护曲率半径形式的设计具有较大的主观性。而实践表明，临时支护的曲率形式对于核心土和导洞的稳定性影响至关重要。以广州龙头山双洞8车道公路隧道为依托，在相同的边界条件下，通过数值计算、实测数据和现场实例，深入分析核心土临时支护的合理曲率形式。其结果旨在为大断面大跨度公路隧道设计的优化提供借鉴和参考。
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| 关 键 词： | 公路隧道 临时支护 曲率半径 优化 |
| 收稿时间： | 2006-05-10 |
Analysis of influence of curvature radius of core-soil temporary support in double pilot tunnel excavation method |
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| QU Hai-feng,ZHU He-hua,CAI Yong-chang.Analysis of influence of curvature radius of core-soil temporary support in double pilot tunnel excavation method[J].Rock and Soil Mechanics,2008,29(7):1778-1782. |
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| Authors: | QU Hai-feng ZHU He-hua CAI Yong-chang |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2.Shanghai Investment Consulting Corporation, Shanghai 200003, China ;3. Key Laboratory of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | The double pilot tunnel method is one of important excavation means for the super big cross-section and large-span road tunnel. It will reduce the excavation area of tunnel face, decrease the construction difficulty and increase the integral stability of tunnel. However, none unified design criterion of the double pilot tunnel method is available. Especially, it will bring out distinct subjectivity to devise the curvature radius of core-soil temporary support. Furthermore, from practice of tunnel construction, it is found that the curvature radius of core-soil temporary support influences stability of tunnel significantly. Therefore, bases on Longtoushan road tunnel with four traveled lanes in each separated hole, the rational curvature form of core-soil temporary support is discussed and studied mainly with numerical analysis, measured data and illustrations in same boundary condition. The purpose of the article is to provide reference for design and optimization of the super big cross-section and large-span road tunnels. |
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| Keywords: | road tunnel temporary support curvature radius optimization |
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