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研究多台阶地形爆破地震波传播规律,并对表征高程的爆破振速预测公式进行验证。通过实际测量与数值模拟的方法,分析确定:高台阶地形的坡顶与坡脚处的高程放大作用均随着高程的增加而先增大后减小;在高程不变的情况下,沿着台阶水平面向两侧延伸,振动速度也存在放大效应,且此放大效应呈现先增大后减小的趋势;目前表征高程放大效应的爆破振速预测公式在爆破震动传播方向与台阶坡面垂直的情况下较为准确,但是,当高程不变,爆心距沿台阶坡面不断增大时,其公式的准确性大幅下降。通过对模拟数据的高斯拟合,建立了更为准确的爆破振速预测公式。
The propagation law of multi-step terrain blasting seismic wave is studied, and the blasting vibration velocity prediction formula that characterizes elevation is verified. By means of actual measurement and numerical simulation, it is analyzed and ascertained that elevation effects at the top and at the slope foot of the high terrace top first increase and then decrease with the increase of the elevation; in the case of the same elevation, The level of the step extends to both sides, and the vibration velocity also has the amplification effect, and the amplification effect firstly increases and then decreases. The prediction formula of the blasting vibration velocity that characterizes the elevation amplification effect is perpendicular to the step slope in the propagation direction of blasting vibration However, the accuracy of the formula dropped drastically when the elevation was constant and the explosive center distance increased along the step slope. Through the Gaussian fitting of the simulation data, a more accurate prediction formula of blasting vibration speed is established.