矿产保护与利用2024，Vol.44Issue(4)：9-17,9.DOI:10.13779/j.cnki.issn1001-0076.2024.04.002
延期时间对逐孔预裂爆破振动衰减规律的影响
Effect of Delay Time on Attenuation Law of Blasting Vibration in Hole-by-hole Presplitting
摘要
Abstract
To obtain the optimal delay time of hole-by-hole pre-splitting blasting,based on Ansys/LS-Dyna finite element software,combined with field experiments,this paper studies the vibration attenuation law of hole-by-hole pre-splitting blasting under different delay time,which provides a theoretical basis for practical engineering application.The results showed that compared with the simultaneous initiation,the hole-by-hole initiation effectively reduced the peak particle vibration velocity(PPV),especially in the area near the pre-split trench.As the delay time increased,the K value of the Sadaovsk formula gradually decreased,while the α value did not change much.When the delay time was greater than 0.6T(T was the duration of single-hole blasting vibration),the values of K and α tended to be stable and close to single-hole blasting.The correction coefficient β was inversely proportional to the delay time,and the optimal delay time should be 0.6 T～1.0 T;the vibration reduction rate of the main blasting area after hole-by-hole pre-splitting was greater than that of the simultaneous pre-splitting blasting.关键词
预裂爆破/逐孔起爆/延期时间/爆破振动/数值模拟Key words
pre-splitting blasting/hole-by-hole blasting/delay time/blasting vibration/numerical simulation分类
矿业与冶金引用本文复制引用
王建国,陶家龙,石飞,万再春..延期时间对逐孔预裂爆破振动衰减规律的影响[J].矿产保护与利用,2024,44(4):9-17,9.基金项目
云南省重大科技专项(202202AG050014) （202202AG050014）
云南省基础研究计划面上项目(202201AT070178) （202201AT070178）
