论文部分内容阅读
由于裂隙或者沟槽对炸药爆炸引起的震动具有良好的隔震作用,所以用现场试验的方法对比研究了用导爆索爆炸形成减震沟槽和人工开挖沟槽的减震效果。用3发50 g TNT当量、1m埋深的爆炸实验,研究了爆破成形和人工开挖预制的两种沟槽的隔震效果。实验结果表明,在爆破成形沟槽的两边存在一定宽度的裂隙区。两种沟槽均有效地降低了爆破震动的幅度并改变了地震波的频谱,而爆破成形沟槽的减震效果优于人工开挖的。离减震沟槽越近,隔震效果越明显。减震沟槽对中远区地震波低频部分隔震效果明显。
Since the fissures or grooves have a good effect of isolating the vibration caused by explosives, the field test method is used to comparatively study the damping effect of the detonation trenches and the artificial trench when detonating the detonating cord. Three shock waves of 50 g TNT equivalent and 1 m depth were used to study the isolation effect of two kinds of trenches by blasting and artificial excavation. The experimental results show that there is a certain width of the fracture zone on both sides of the blasting groove. Both types of grooves effectively reduce the amplitude of blasting vibration and change the spectrum of seismic waves, while the shock-absorbing effect of blasting grooves is better than that of artificial excavation. The closer the isolation groove, the more obvious the isolation effect. Vibration damping groove on the long-distance seismic wave low frequency part of the isolation effect is obvious.