减震带对台阶爆破地震效应的影响

EFFECT OF SHOCK ABSORPTION ZONE ON SEISMIC EFFECT OF BENCH BLASTING

采用动力有限元方法,利用ANSYS/LS-DYNA软件建立了无减震带和有减震带的爆破地震效应的数值模型,研究了质点振动速度与爆破应力波的变化,分析了减震带对台阶爆破地震效应的影响。结果表明,质点振动速度随着爆心距的增加而减小,但有减震带的原点振幅较小,振幅平均降低84%;应力波传播过程中,从减震带的底部绕射,减震带对地震波有阻隔延迟作用,可将其应用到露天爆破工程。

Using dynamic finite element method and ANSYS/LS-DYNA software, a numerical model of blasting seismic effect with and without shock absorption zone is established. The variation of particle vibration velocity and blasting stress wave is studied, and the influence of shock absorption zone on the seismic effect of bench blasting is analyzed. The results show that the particle vibration velocity decreases with the increasing of the blasting center distance, but the amplitude of origin with shock absorption belt is small and the amplitude decreases by 84%. The Stress wave is diffracted from the bottom of the shock absorption zone during its propagation, and the damping band has a delayed effect on the seismic wave, so it can be applied to the open blasting project.