地震波跨河道传播衰减规律及振速预测

The Seismic Waves Propagation Attenuation Law Across the Channel and the Velocity Prediction

为了分析河道对爆破地震波传播的影响并提高预测河道对岸测点振速的准确性,采用ANSYS/LSDYNA软件建立不同河道参数的模型。模拟结果表明:河道对岸测点峰值振速与河道宽度为负相关关系;河道深度和河道与爆源距离的改变对河道岸边近区地震波的传播影响较大,对远区影响较小;水深对地震波的传播影响较小。然后结合模拟结果和量纲分析法,对萨道夫斯基公式进行修正,经金堆城矿区现场爆破试验验证,其预测的振速误差较萨道夫斯基公式平均降低了约79.43%,更适用于预测地震波跨河道传播振速。

To analyze the impact of river on blasting seismic wave propagation and improve the velocity prediction accu- racy of the measuring point across the river shore, the ANSYS/LS-DYNA software is adopted to set up different parameters of the channel model. The simulation results show that the peak velocity of measuring points has a negative correlation with the channel width ; The change of channel depth and distance between channel and explosive source greatly affects the seismic wave propagation at the near area of river shore, but less at the far area of river shore ; The depth of water has little impact on the spread of seismic wave. Combining with the simulation results and the dimension analysis method, the Sadov＇s Vibration Formu- la is remedied and verified at Jinduicheng blasting experiments. The predicted blasting error is decreased by about 79.43%, compared with that of the previous Sadov＇s vibration formula. It is more suitable to predict seismic wave spread velocity across the river.