减振孔对爆破振动的影响规律研究

发布时间：2018-03-20 01:33

本文选题：爆破振动　切入点：减振孔　出处：《矿业研究与开发》2016年09期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to study the velocity variation characteristics of vibration absorption holes encountered during the propagation of blasting seismic waves, reasonable hole spacing is set according to the variation characteristics, and the damping effect of the damping holes is improved, and the measuring points are arranged on both sides of the damping holes. Contrastive tests were made on both sides of the damping hole and simultaneous monitoring on both sides, and the monitoring results were analyzed. The results show that, in the direction of propagation, the velocity of each direction between the explosion source and the damping hole decreases first and then increases. Between the damping hole and the object of protection, the vibration velocity of each direction increases first and then decreases, and after the blasting seismic wave propagates to the damping hole, the vibration velocity of each direction after passing through the damping hole is larger than that before passing. The frequency of blasting seismic wave increases sharply after it meets the damping hole, which can effectively prevent the protected object from resonance, at the same time, accelerate the energy attenuation rate of blasting seismic wave, and weaken the damage energy when it reaches the protected object. In order to improve the damping effect of the damping hole, for the damping hole with the aperture of 90 mm, when the distance of the hole is 25 cm, the distance between the holes is suggested to be 4075 cm.
【作者单位】：贵州大学矿业学院;贵州新联爆破工程集团有限公司;
【分类号】：TD235.11

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