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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。
In order to study the mechanical behavior of roadway rock mass under the fault-rock-type rock burst under different focal mechanisms, a numerical calculation based on Haskell fault model was carried out. The results show that the peak vibration velocity (PPV) of rock mass in the S wave radiation quadrant is obviously larger than that of the rock mass in the quadrant of P wave radiation. The mechanism of rock mass vibration response under normal faults, reverse faults and strike-slip faults is analyzed. It is found that the PPVs in the normal and reverse faults are equal in magnitude and opposite in direction, but much larger than the PPV value. The calculated value of PPV in roadway rock mass in the S-wave radiation quadrant is larger than that calculated by KAISER design scale rate. It is also found that the roof of the roadway is prone to destabilizing collapse when subjected to reverse fault, while the spandrel and floor are more affected by the normal fault Prone to instability damage.