微差时间及柱状装药特征对爆破振动效应影响研究

发布时间：2018-08-24 13:53

【摘要】：为了研究炮孔装药特征及微差时间对爆破振动效应影响,根据短柱装药爆破产生振动波的特点,研究双孔微差爆破振速的局部放大效应,同时在短柱装药爆破的基础上,研究长柱装药特征及起爆方式对炸药爆破振动效应的影响,得到长柱装药爆破下,药包长度、爆轰速度、埋置深度、起爆方式及围岩介质变化等对质点振速的影响,并利用萨氏公式拟合了柱状装药爆破下质点峰值速度。分析表明:局部放大效应的幅值及范围与微差时间和爆破荷载衰减系数密切相关。对于药包顶端以下点,当装药长度增加到一定程度时,质点振速不再随之增加,同时爆轰速度对爆破振动效应的影响也只限制在一定速度范围内。对于药包顶端以上点,柱状装药埋置长度越长,地表振速越大。不同的起爆方式下,底部起爆振速最大,其次是两端起爆,最小的是顶端起爆。距离爆源越近处的质点的振动效应受围岩介质变化影响越明显。柱状装药拟合得到的萨氏公式能较好地表征出长柱装药爆破振动峰值速度特点,球状装药拟合得到的萨氏公式不能表示长柱装药爆破振动特征。
[Abstract]:In order to study the influence of charge characteristics and millisecond time on blasting vibration effect, according to the characteristics of vibration wave produced by short column charge blasting, the local amplification effect of two-hole millisecond differential blasting vibration velocity is studied. At the same time, based on short column charge blasting, the local amplification effect of vibration velocity of double-hole millisecond blasting is studied. The effect of charge characteristics and initiation mode on blasting vibration effect of long column explosive is studied. The effects of charge package length, detonation velocity, buried depth, initiation mode and surrounding rock medium on particle vibration velocity under long column charge blasting are obtained. The peak velocity of particle under cylindrical charge blasting is fitted by Saarland formula. The analysis shows that the amplitude and range of the local amplification effect are closely related to the millisecond time and the attenuation coefficient of blasting load. When the charge length increases to a certain extent, the particle vibration velocity does not increase, and the effect of detonation velocity on the blasting vibration effect is limited to a certain range. For the point above the top of the charge pack, the longer the embedded length of the cylindrical charge, the greater the surface vibration velocity. Under different initiation modes, the vibration velocity of bottom detonation is the highest, the second is the end detonation, and the smallest is the top detonation. The vibration effect of the particle near the detonation source is more obviously affected by the change of surrounding rock medium. The Saxhlet formula obtained by cylindrical charge fitting can better characterize the peak velocity of blasting vibration of long column charge, and the Saxhlet formula obtained by fitting spherical charge can not express the characteristics of blasting vibration of long column charge.
【作者单位】：华侨大学土木工程学院;华侨大学福建省隧道与城市地下空间工程技术研究中心;
【基金】：国家自然科学基金资助项目(11672112) 爆炸冲击防灾减灾国家重点实验室开放课题(DPMEIKF201307) 华侨大学科研基金项目(13BS402)~~
【分类号】：TB41

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