| 大断面黄土隧道初期支护合理施作时机 |
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| 引用本文： | 周烨,李鹏飞,张翾.大断面黄土隧道初期支护合理施作时机[J].北方交通大学学报,2012(1):41-47. |
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| 作者姓名： | 周烨 李鹏飞 张翾 |
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| 作者单位： | [1]北京交通大学隧道及地下工程教育部工程研究中心,北京100044 [2]中铁十九局集团有限公司,北京100176 [3]铁道部经济规划研究院,北京100844 [4]清华大学土木工程系,北京100084 [5]北京交科公路勘察设计研究院有限公司,北京100191 |
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| 基金项目： | 铁道部科技研究开发计划项目资助（2009（3005.B） |
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| 摘 要： | 支护结构的合理设计是大断面黄土隧道设计的关键环节，结合在建铁路黄土隧道，采用数值模拟，分析大断面黄土隧道在不同初期支护时机情况下，支护结构、围岩受力状态和力学行为的变化情况．以控制围岩变形为核心，对大断面黄土隧道施工中，初支施作时机的选择给出了合理的建议．通过现场监测手段，得到了黄土隧道初期支护受力规律：黄土具有明显的流变特性，支护结构的受力很大一部分来自围岩流变产生的附加荷载；支护结构受力在空间分布上并不均匀对称，这些在设计中都应加以考虑．
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| 关 键 词： | 黄土隧道 数值模拟 支护时机 现场监测 |
Study on construction time of of large initial support in loess tunnel sections |
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| ZHOU Ye,LI Pengfei,ZHANG Xuan.Study on construction time of of large initial support in loess tunnel sections[J].Journal of Northern Jiaotong University,2012(1):41-47. |
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| Authors: | ZHOU Ye LI Pengfei ZHANG Xuan |
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| Institution: | 1. Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; 2. China Railway 19th Bureau Group Co., Ltd, Beijing 100176, China; 3. Economic and Planning Research Institute of the Ministry of Railways, Beijing 100844; 4. Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 5. RIOH Transport consultants LTD. Beijing 100191, China) |
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| Abstract: | The rational design of supporting structure is the key to the design of large section loess tunnel, focusing on a loess railway tunnel in construction, this paper analyses the change situations of the loess tunnel supporting structure, rock stress state and mechanical behavior under the different construction times of initial support by numerical simulation. Centering on the controlling of the rock deformation, a reasonable proposal for construction time of initial support is given. And the force law of loess tunnel initial support is also summed up with the outcomes of field monitoring. Loess has a significant rheological property. A large part of the force acting on the supporting structure is caused by the additional load generated by rock rheology. In addition, the force of supporting structure is not evenly distributed and symmetrical in the space, which should be considered in the design. |
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| Keywords: | loess tunnel numerical simulation construction time field monitoring |
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