| 复杂地质条件下偏压连拱隧道中隔墙变形与受力特征 |
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| 引用本文： | 王少强,乔春生,徐干成,朱正国.复杂地质条件下偏压连拱隧道中隔墙变形与受力特征[J].岩土力学,2007,28(Z1):449-454. |
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| 作者姓名： | 王少强 乔春生 徐干成 朱正国 |
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| 作者单位： | 1. 安徽省交通投资集团有限责任公司，合肥 230011；2. 北京交通大学 土木建筑工程学院，北京 100044； 3. 空军工程设计研究局，北京 100077 |
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| 摘 要： | 中隔墙是连拱隧道的重要构件，施工期间的受力及变形规律十分复杂，如何保护中隔墙免受偏压影响是连拱隧道施工中的重要课题。以富溪连拱隧道进口偏压段施工为背景，通过对施工过程的三维数值模拟，对偏压、软弱破碎围岩条件下中隔墙受力及变形规律进行了分析。结果表明，施工期间中隔墙会受到十分明显的偏压作用而朝浅埋侧摆动，地形偏压导致中隔墙中上部朝隧道浅埋侧变形，两侧隧道的错距开挖则会引起中隔墙左右小幅摆动；中隔墙晚接顶能有效改善中隔墙的受力状态，减小偏压影响。据此制定了有效防偏措施，实践证明效果良好。
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| 关 键 词： | 中隔墙 双连拱隧道 偏压 数值分析 变形 |
| 收稿时间： | 2007-05-25 |
Deformation and stress distribution of middle-wall for asymmetrically-loaded double-arch tunnel under complicated geological conditions |
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| WANG Shao-qiang,QIAO Chun-sheng,XU Gan-cheng,ZHU Zheng-guo.Deformation and stress distribution of middle-wall for asymmetrically-loaded double-arch tunnel under complicated geological conditions[J].Rock and Soil Mechanics,2007,28(Z1):449-454. |
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| Authors: | WANG Shao-qiang QIAO Chun-sheng XU Gan-cheng ZHU Zheng-guo |
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| Institution: | 1. Anhui Provincial Communications Investment Group Co. Ltd., Hefei 230011, China; 2. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China; 3. Air Force Engineering Design and Research Bureau, Beijing 100077, China |
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| Abstract: | Middle wall is an important structure of a double-arch tunnel. To prevent harmful influence by unsymmetrical pressure on middle-wall has become the key problem during double-arch tunnel construction because of its complicated stress and deformation rule. Based on the construction of eccentrically compressed entrance of Fuxi highway double-arch tunnel with heavily jointed soft rock mass, the deformation and internal stress distribution behaviors of the middle wall is analyzed by the three-dimensional numerical simulation in the course of construction. It can be concluded from the result that the top of middle wall moved towards shallow side effected by partial load induced by terrain, and the middle wall also moved backwards and forwards with excavation of left and right tunnel differently. If the top clearance of middle wall is not filled immediately, the displacement and internal stress state of middle wall can be improved effectively. According to the conclusions above some suggestions are made for construction of Fuxi tunnel. |
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| Keywords: | middle wall double-arched tunnel unsymmetrical pressure numerical simulation deformation |
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