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| 1 | Simulation of Stress Distribution around Tunnels and Interaction between Tunnels Using an Elasto–plastic Model显示文摘This article presents a computer simulation of stress distribution around tunnels and interaction between tunnels using an elasto-plastic model. A finite element method using ANSYS software has been used for the analyses of one and two tunnels at different overburden depths with different separating distances between the tunnels. The results of numerical analyses indicate that stress distribution and stress concentration around the tunnels vary with the overburden depths. It is found that the coefficients of stress concentration for elasto-plastic medium are smaller than those for elastic one by 1.9%. Furthermore, the interaction between the two tunnels rapidly decreases with the increase of separation distance between them. In addition, for quantitatively describing the interaction between the two tunnels, a critical separation distance is introduced. The critical separation distances between the two tunnels at different overburden depths are 8 m, 12 m, and 14 m respectively. This fact is very important and essential for the design of mining tunnels and to ensure safety in tunnel engineering. | Muya M S 何波 王靖涛 李国成 | 2007 | Journal of China University of Geosciences2007，18，1： | 3 |
| 2 | Effects of Rock Bolting on Stress Distribution around Tunnel Using the Elastoplastic Model显示文摘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. | Muya M S 何波 王靖涛 李国成 | 2006 | Journal of China University of Geosciences2006，17，4： | 2 |
| 3 | Effect of virginiamycin and monensin supplementation on performance of multiparous Holstein cows 显示文摘 | Erasmus L Muya C Erasmus S | 2008 | Livestock Science2008，119，1： | 1 |
| 4 | 显示文摘 | Suziki S Sakumoto H Muya S | 1984 | IEEE Trans Magn1984，20，1： | 1 |
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