【摘要】 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。更多还原

【Abstract】 Gap or slot has an important effect on reduction of blasting vibration.The effect of vibration isolation and damping of gap or slot,which formed by detonation of the blasting fuse and excavation through manual work,is studied in this paper.In order to investigate the action of gap or slot,three underground explosion experiments were carried out on the north side of gap or slot,whose equivalent is 50g TNT and embedded depth is 1 m.The Pre-split crack zone exists in both sides of gap or slot formed by detonation of the blasting fuse.The experimental results show that the effects of gap or slot on reduction of blasting vibration are distinct and the explosion earthquake wave frequency spectrum characteristics are changed.The effect of gap or slot formed by detonation of the blasting fuse is superior to that of men-made gap or slot.The closer to gap or slot excavation face,the better the effect on reduction of blasting vibration is;The effects on vibration reduction are distinct to low frequency seismic wave at far distance from the gap or slot excavation face.更多还原