断层滑移扰动下不同辐射区岩体响应特征

Response Characteristics of Rock Mass in Different Radiation Zones Under Disturbance of Fault Slip

为了研究不同应力波辐射区岩体稳定性,引入Haskell有限震源模型,采用修正Yoffe函数计算特定震动矩下断层滑移速度曲线,构建了等效断层滑移型震源,进而利用数值仿真手段,对P波、S波辐射区在断层滑移作用下岩体响应特征进行模拟。结果表明,断层滑移的时间效应对P波、S波辐射区的质点震动强度影响较大。在超过距离震源中心1倍处,质点在S波辐射区的质点峰值速度Vppv(peak particle velocity)值要明显高于P波辐射区的PPV值,但位移量及获得的应变能则相对较小。

In order to study the stability of rock masses in different stress wave radiation zones,the Haskell finite seismic source model was introduced,the modified Yoffe function was used to calculate the fault slip velocity curve under a certain vibration moment,accordingly,an equivalent fault-slip seismic source was constructed.Furthermore,numerical simulation methods were applied to simulate the response characteristics of the rock mass under the action of fault slip in the radiation zones of P wave and S wave.The results showed that the time effect of fault slip had apparent impact on the particle vibration intensity in the radiation zones of P wave and S wave.More than one time from the epicenter,the PPV value of the particle in the S-wave radiation zone was significantly higher than that in the P-wave radiation zone,however,the displacement and strain energy obtained were relatively small.