| 不同围压条件下的圆形巷道岩爆过程模拟 |
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| 引用本文： | 王学滨,潘一山,王玮.不同围压条件下的圆形巷道岩爆过程模拟[J].地震学刊,2009(6):597-603. |
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| 作者姓名： | 王学滨 潘一山 王玮 |
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| 作者单位： | 辽宁工程技术大学力学与工程学院,辽宁阜新123000 |
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| 基金项目： | 国家自然科学基金重大项目及青年基金项目（50490275,50309004）资助 |
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| 摘 要： | 利用FLAC模拟了不同围压条件下圆形巷道的岩爆过程。为了模拟巷道开挖，利用编写的FISH函数删除巷道内部的单元。岩石服从摩尔库仑剪破坏与拉破坏复合的破坏准则，破坏之后呈现应变软化-理想塑性行为。模拟结果表明：当围压较低时，剪切应变集中区域呈圆环状，围岩能保持稳定，不出现剪切带；当围压增加到一定程度时，围岩中出现了“狗耳”形的V形坑，发生岩爆，但围岩也还能保持稳定；当围压进一步增加时，围岩中出现了多条狭长的剪切带，巷道的整个断面均遭到了破坏，发生强烈的岩爆。随着围压的增加，V形岩爆坑变大、变深，剪切带花样的对称性变差；在高围压时，剪切带花样与塑性力学中的滑移线网有类似之处。
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| 关 键 词： | 圆形巷道 V形岩爆坑 围压 破坏形态 数值模拟 |
Numerical Simulation of Rockburst Processes of a Circular Tunnel at Different Confining Pressures |
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| WANG Xue-bin,PAN Yi-shan,WANG Wei.Numerical Simulation of Rockburst Processes of a Circular Tunnel at Different Confining Pressures[J].Journal of Seismology,2009(6):597-603. |
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| Authors: | WANG Xue-bin PAN Yi-shan WANG Wei |
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| Institution: | (College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China) |
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| Abstract: | Rockburst processes of a tunnel at different confining pressures are simulated by using of FLAC. To simulate the tunnel excavation, a FISH function is written and used to delete the elements in the tunnel. As rock elements exhibit linear strain-softening behavior after the occurrence of failure and then ideal plastic behavior, the failure criterion is a composite Mohr-Coulomb criterion with tension cutoff. Results show that an annular shear strain concentration zone, which is closer to the tunnel surface, is generated at lower confining pressures. The tunnel is still stable after rockbursts and no shear bands are observed. When the confining pressure increases to a certain value, dog-ear or V-shaped rockburst notches are generated in the surrounding rock and the surrounding rock is stable. However, when the confining pressure further increases, many long shear bands are generated in the surrounding rock and the entire section of the tunnel is destroyed, suggesting that violent rockbursts take place. With increase of the confining pressure, V-shaped notches become wider and deeper and the symmetry of shear band patterns becomes weaker. At higher confining pressures, shear hand patterns are similar to plastic slip lines in plastic mechanics. |
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| Keywords: | circular tunnel V-shaped rockburst notch confining pressure failure pattern numerical simulation |
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