城镇浅孔爆破逐孔起爆合理延时的研究  

Study on Reasonable Interval Time of Hole-by-hole Initiation in Town Short-hole Blasting

作　　者：高腾飞[1] 张智宇[1] 王鑫尧 马军[1] 李祥龙[1] 

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093

出　　处：《爆破》2016年第1期78-83,共6页Blasting

基　　金：国家自然科学基金项目(51564027);云南省应用基础研究计划基金资助项目(2013FZ036)

摘　　要：以昆明市某深基坑爆破开挖工程为背景,构建浅孔逐孔起爆的三维数值计算模型,对不同延时的应力时程和质点峰值振速进行数值模拟,获得浅孔逐孔起爆的合理延时。模拟研究结果表明:延时35 ms、50 ms均可获得良好的岩石破碎效果,但延时35 ms引起的质点峰值振速更小,故针对工程要求的松动爆破,延时35 ms的逐孔起爆模型效果更佳。现场试验结果表明:延时35 ms的方案从岩石破碎、飞石及振动等各方面综合来看,效果是最佳的,验证了数值模拟计算结果的正确性。Taking the blasting excavation project of a deep foundation trench in Kunming as the background,the3 D calculation model of short-hole blasting by hole-by-hole initiation was established to simulate the stress time-history and the paticular peak velocity of different delay time,and got the reasonable interval time of hole-by-hole initiation. The results of simulation show that the delay time 35 ms or 50 ms can get good rock fragment effects,but the paticular peak velocity of delay time 35 ms smaller,so the hole-by-hole initiation whith 35 ms interval can get better effects according to the required loosening blasting of project. The results of field test also proved that the plan of delay time 35 ms can get the best effects from comprehensive consideration of rock fragment,fly rock and blasting vibration,validated the results of numerical simulation.

关 键 词：浅孔爆破 逐孔起爆 合理延时 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]