| 均质岩体中隧道围岩破坏过程的试验与数值模拟 |
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| 引用本文： | 汪成兵.均质岩体中隧道围岩破坏过程的试验与数值模拟[J].岩土力学,2012,33(1):103-108. |
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| 作者姓名： | 汪成兵 |
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| 作者单位： | 交通运输部公路科学研究院，北京 100191 |
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| 基金项目： | 国家自然科学基金资助项目(No.51008289) |
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| 摘 要： | 采用模型试验与离散元模拟的方法，对均质岩体中隧道开挖后围岩的变形破坏过程进行了研究，并对围岩变形破坏过程中围岩应力及地表位移的变化规律进行了分析，模型试验结果与数值模拟结果取得了较好的一致性。研究结果表明：隧道开挖后，拱顶处围岩变形明显并出现裂缝，围岩破坏从拱顶开始，进而呈渐进式向上发展，最终形成稳定的塌落拱；开挖后，隧道围岩径向应力减小，隧道周边一定范围内围岩切向应力减小，且随隧道变形破坏的发展，围岩切向应力减小的区域逐渐扩大；隧道塌方后，拱底垂直应力增加，开挖结束至塌方开始期间地表位移增量最大，塌方期间地表位移增量最小。
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| 关 键 词： | 均质岩体 破坏过程 模型试验 离散元法 |
| 收稿时间： | 2010-04-02 |
Laboratory and numerical investigation on failure process of tunnel constructed in homogeneous rock |
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| WANG Cheng-bing.Laboratory and numerical investigation on failure process of tunnel constructed in homogeneous rock[J].Rock and Soil Mechanics,2012,33(1):103-108. |
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| Authors: | WANG Cheng-bing |
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| Institution: | Research Institute of Highway, Ministry of Transport, Beijing 100191, China |
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| Abstract: | The failure process of tunnel constructed in homogeneous rock is studied by using model test and discrete element method(DEM);and the laws of the stress of surrounding rock and their displacement during the failure process are analyzed.The results of model test match the results of numerical simulation perfectly.From the results some conclusions can be drawn.The surrounding rock of the arch crown deforms obviously after excavation.The failure of the surrounding rock initiates from the arch crown and develops upward progressively until a stable caving arch is formed.The radial stress and tangential stress in a given range of the surrounding rock decrease after excavation.The range in which tangential stress of the surrounding rock decreases expands outward during the tunnel failure process.The vertical stress of the arch bottom increases after collapse.The displacement increment from excavation to collapse is the biggest and that during the collapse is the smallest. |
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| Keywords: | homogeneous rock failure process model test discrete element method |
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