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为降低掏槽区域爆破振动,减少掏槽区域的炸药雷管单耗,提高掏槽孔的炮孔利用率,以青岛地铁2号线延安路站侧穿166号居民楼试验段为工程背景,对施工现场4种不同类型掏槽的爆破效果进行对比研究。结果表明,大直径中空孔直眼掏槽的比钻眼最大,约是楔形掏槽的3倍;楔形掏槽无论是爆破振动控制还是炮孔利用率,均优于大直径中空孔直眼掏槽;从雷管和炸药单耗的指标来看,楔形掏槽经济效果显著;掏槽孔逐孔起爆技术极大降低了爆破振动,且不会影响多级楔形掏槽槽腔成型质量。
In order to reduce the blasting vibration of undercutting area, reduce the unit charge of explosive detonator in undercutting area and improve the utilization rate of blasthole of undercutting hole, take the test section of 166 residential buildings in Yan’an Road Station of Qingdao Metro Line 2 as background, Construction site 4 different types of undercutting blasting effect of comparative study. The results show that the diameter of the large-diameter hollow hole is larger than that of the undercutting hole, which is about three times of that of the wedge-shaped undercutting. The wedge-shaped undercutting is superior to that of the large-diameter hollow hole in terms of blasting vibration control and hole utilization Slot; from the detonator and explosive unit consumption indicators, the economic effect of wedge cut significantly; cut hole hole explosion technology greatly reduces the blasting vibration, and will not affect the quality of multi-level wedge cut groove cavity.