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
王建国 1陶家龙 2石飞 3万再春4
作者信息
- 1. 昆明理工大学 国土资源工程学院,云南 昆明 650093;云南省教育厅爆破新技术工程研究中心,云南 昆明 650093
- 2. 昆明理工大学 国土资源工程学院,云南 昆明 650093
- 3. 云南上立矿业有限公司,云南 昆明 650299
- 4. 云南铜业股份有限公司矿山研究院,云南 昆明 650224
- 折叠
摘要
为了获得逐孔预裂爆破的最优延期时间,基于Ansys/LS-Dyna有限元软件,结合现场实验研究了不同延期时间下逐孔预裂爆破的振动衰减规律,为实际工程应用提供了理论依据.结果表明:与齐发起爆相比,逐孔起爆可以有效地降低质点峰值振动速度(PPV),特别是预裂沟附近区域;随着延期时间的增大,萨道夫斯基公式的K值逐渐减小,而α值变化不大,当延期时间大于 0.6T(T为单孔爆破振动持续时间)时,K与α的值趋于稳定,接近于单孔爆破;校正系数β与延期时间成反比,最优延期时间应为 0.6T～1.0T;逐孔预裂成缝后对主爆区的减振率大于齐发预裂爆破.
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引用本文复制引用
基金项目
云南省重大科技专项(202202AG050014)
云南省基础研究计划面上项目(202201AT070178)
出版年
2024
国家科技期刊平台
NSTL
万方数据