爆破震动频率对边坡稳定性的影响

摘要

建立爆破地震波作用下的边坡震动有限元模型,利用模态分析、谐响应分析得到边坡固有频率,利用瞬态动力学分析方法,得到不同爆破频率作用下的边坡动力响应.最后分析预测适合该地区边坡的爆破频率.研究结果表明:通过调整爆破规模,选择合适的爆破主频,避免与边坡固有频率产生共振,可提高边坡稳定性.%A slope finite element model with the blasting seismic waves was set up. Using modal analysis and harmonic response analysis, the natural frequency of the slope was obtained. The slope dynamic response at different blasting frequencies was obtained through transient dynamics analysis. Finally, the reasonable blasting frequency was forecasted for the slope. The results show that by adjusting the blasting scale and choosing appropriate blasting frequency to avoid producing resonance with the slope, the stability of the slope can be improved.