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为了研究爆破地震波在传播过程中遇到减振孔时的速度变化特征,根据其变化特征设置合理的孔排距,提高减振孔的减振效果,在减振孔两侧布置测点,对减振孔两侧分别监测和两侧同时监测做对比试验,并对其监测结果进行分析。结果表明:沿传播方向上,在爆源和减振孔之间,各向速度呈先减小后增大,在减振孔和保护对象之间,各向震动速度呈现先增大后减小,而且爆破地震波传播到减振孔之后,经过减振孔后的各向震动速度大于经过前的震动速度;爆破地震波传播遇到减振孔后其频率急剧增大,可有效防止被保护物发生共振,同时加快爆破地震波能量衰减速率,减弱到达被保护物时的破坏能量;为了提高减振孔的减振效果,对于孔径为90mm的减振孔,当孔距为25cm时,排距建议设置为40~75cm。
In order to study the velocity variation of blasting seismic wave when it encounters vibration-damping hole in the process of propagation, a reasonable hole-row spacing is set according to its changing characteristics to improve the damping effect of vibration-damping hole. The measuring points are arranged on both sides of the vibration- Vibration control holes on both sides of the monitoring and monitoring of both sides at the same time do comparative tests, and monitoring results were analyzed. The results show that in the direction of propagation, the velocity between the explosion source and the vibration reduction hole decreases first and then increases. The vibration velocity increases first and then decreases between the vibration reduction hole and the protection object , And after the blasting seismic wave propagates to the vibration damping hole, the vibration velocity in all directions after passing through the vibration damping hole is greater than the vibration velocity before passing through. After the blasting seismic wave propagates and encounters the vibration damping hole, its frequency rapidly increases, which can effectively prevent the object being protected from happening Resonance, while accelerating the energy attenuation rate of blasting seismic waves, reducing the damage energy reaches the protected object; In order to improve the vibration damping effect of damping holes, for the aperture of 90mm damping holes, when the pitch is 25cm, For 40 ~ 75cm.