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为了研究孔底空气间隔装药降低爆破振动效应的最佳空气层比例,进行了现场试验。首先,利用实测的爆破振动速度信号采用直接微分法获得了加速度信号,并利用EE-MD分解对加速度信号进行低通滤波去噪处理,获得了准确清晰的加速度曲线。然后,利用精确法求得了不同空气层比例下爆破振动信号的速度反应谱和标准速度反应谱。最后以能综合反映爆破振动特性与结构响应特性的速度反应谱峰值作为指标进行降振最佳空气层比例的选取,速度反应谱的峰值最小时的空气层比例为降低爆破振动效应的最佳值。
In order to study the ratio of the optimum air layer to reduce the blasting vibration effect of the air space charge at the bottom of hole, a field test was carried out. First of all, the acceleration signal is obtained by the direct differential method using the measured blasting vibration velocity signal, and the acceleration signal is low-pass filtered and denoised by using EE-MD decomposition to obtain an accurate and clear acceleration curve. Then, using the exact method, the velocity response spectra and standard velocity response spectra of blasting vibration signals under different air layer ratios were obtained. Finally, taking the peak value of the velocity response spectrum that can comprehensively reflect the vibration characteristics and structural response of blasting as the index, the proportion of the air layer with the lowest peak value of the velocity response spectrum is the optimum value to reduce the blasting vibration effect .