| Effects of Rock Bolting on Stress Distribution around Tunnel Using the Elastoplastic Model |
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| 作者姓名： | Muya M S 何波 王靖涛 李国成 |
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| 作者单位： | School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China，School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China，School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China，School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China |
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| 基金项目： | The authors would like to thank Prof. Wang Jingtao for his support of this work and colleagues of the geotechnical engineering research group at the School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, for their technical inputs and comments. |
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| 摘 要： | INTRODUCTIONThe stability of underground structures duringand after excavation is the most i mportant factor fordesigners because any kind of collapse may destroylarge parts of a finished tunnel,thereby causing ma-jor repairs and ti me loss.To avoid this problem,rock bolts are widely used as ani mportant support el-ement.These are economical,have a short installa-tion ti me,and provide reinforcement to maintain theintegrity of the stressed rock.The effect of the bearing capacity of rock b…
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| 关 键 词： | 岩石 应力分布 弹性塑料 计算机模拟 隧道 |
| 收稿时间： | 2006-06-19 |
| 修稿时间： | 2006-09-25 |
Effects of Rock Bolting on Stress Distribution around Tunnel Using the Elastoplastic Model |
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| Muya M S,He Bo,Wang Jingtao,Li Guocheng.Effects of Rock Bolting on Stress Distribution around Tunnel Using the Elastoplastic Model[J].Journal of China University of Geosciences,2006,17(4):607-341,354. |
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| Authors: | Muya M S He Bo Wang Jingtao Li Guocheng |
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| Institution: | School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China |
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| Abstract: | To ensure the stability of a tunnel during construction, rock bolts are usually installed, which affects the stress distribution around the tunnel. Therefore, it is necessary to study the effects of rock bolting on the stress distribution around the tunnel. In this article, the effects of rock bolting on the stress distribution around the tunnel, including the position and orientation of bolts, the overburden depths, and the bolt lengths, are simulated using the ANSYS software with an elastoplastic model. The effect of multiple bolts of 2 m and 1 m lengths on the stress distribution in the roof and on the lateral sides of a tunnel and at different overburden depths is considered. An important finding is that the tensile stress region that is very dangerous for rock in the bottom of the tunnel grows rapidly with increasing overburden depths when rock bolts are installed only in the roof or on the lateral sides of a tunnel. The determination of the length of the rock bolt used around a tunnel is dependent on the loads and the integrity of the rock mass around the tunnel. In addition, rock bolting around the tunnel can obviously reduce the coefficients and the size of the region of stress concentration, especially when installed in high-stress areas. This fact is very important and essential for the design of tunnels and ensures engineering safety in tunnel engineering. |
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| Keywords: | computer simulation tunnel stress distribution rock bolt overburden depths |
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