负高差地形爆破振动规律研究

Study on blasting vibration law of negative height difference topographic

为了研究负高差地形对爆破振动波传播的影响,对广东陆丰核电站观景平台爆破工程进行了长时间的爆破振动监测。通过对监测数据的对比分析得出了负高差地形下爆破振动规律。结果表明:相较于平整地形,在负高差地形下,爆破振动速度在水平方向上表现出整体衰减、局部异常的现象,在垂直方向上则表现为整体衰减。同时,发现在负高差地形下,炮孔的深度L与坡的高度H之间的大小关系对爆破振动波的传播影响较大;L>H时,炮孔底部装药低于测点,出现高程放大效应。该放大效应与地形对波的叠加相互作用,致使爆破振动波表现出整体衰减、局部异常的现象;L<H时,边坡的坡面相当于沟槽,阻碍爆破振动波的传播,使爆破振动波整体表现出衰减效应。

In order to study the influence of negative height difference topography on blasting vibration wave propagation,a long-term blasting vibration monitoring was carried out on the viewing platform of Lufeng Nuclear Power Station in Guangdong Province.By comparing and analyzing the monitoring data,the blasting vibration law under the negative height difference is obtained.The results show that compared with the flat topography,the blasting vibration velocity exhibits the phenomenon of overall attenuation and local anomaly in the horizontal direction under the negative height difference topography,and the overall attenuation in the vertical direction.At the same time,it is found that the blasting vibration wave propagation is greatly affected by the magnitude relationship between the depth of the hole L and the height of the slope H under the negative height difference topography.When L>H,the charge at the bottom of the hole is lower than the measuring point,resulting in the elevation amplification effect.The amplification effect interacts with the superposition of topographic waves,resulting in the phenomenon of overall attenuation and local anomaly of blasting vibration waves.When L<H,the slope surface is like a groove,which hinders the propagation of blasting vibration waves and makes the whole blasting vibration waves show the attenuation effect.