【摘要】 为研究不同震源机制下巷道岩体在断层滑移型岩爆作用下的力学行为,基于Haskell断层模型开展数值计算。结果显示,处于S波辐射象限的岩体质点峰值振动速度(PPV)明显大于处于P波辐射象限的岩体的相应值。分析巷道在正断层、逆断层和走滑断层作用下的岩体震动响应机制,发现岩体处于正断层和逆断层作用时其PPV大小相等、方向相反,但远大于受走滑断层作用时的值。处于S波辐射象限的巷道岩体PPV计算值大于KAISER设计尺度率计算结果,同时发现,巷道顶板在受到逆断层作用时易发生失稳垮落,而拱肩和底板则在正断层作用下更容易发生失稳破坏。更多还原

【Abstract】 To study the mechanical behaviors of rockmass around tunnel under fault slip rockburst, numerical calculations based on Haskell model were performed and the results indicated that the rockmass in S wave radiation lobe is subjected to larger velocity loading than that in P wave radiation lobe. The ground motion of tunnel under normal fault, reverse fault and strike fault were investigated and the results show that the rockmass vibration velocity under normal fault slip condition and that under reverse fault slip condition are equal in magnitude but opposite in direction, which are much greater than that in strike fault case.The PPV of rockmass around tunnels in S wave radiation lobe are larger than the value calculated by design scaling law proposed by KAISER. Moreover, the tunnel roof falling is prone to be occurred under reverse fault-slip condition while the pillar failure and floor heaven of roadway will take place easily in the case of normal fault-slip.更多还原