基于LS-DYNA的扇形中深孔逐孔起爆段别优化
Optimization of millisecond parameters for hole by hole initiation in fan-shape deep holes based on LS-DYNA
邓红卫 1杨懿全 1高峰 1周科平 1张健1
作者信息
- 1. 中南大学资源与安全工程学院,长沙410083
- 折叠
摘要
梅山铁矿是典型的“城市矿山”,控制爆破振动效应对周边建筑安全意义重大.为优化其微差参数,降低爆破振动效应,利用LS-DYNA建立了准二维扇形中深孔爆破模型,在原典型微差方式的基础上,设计了五种不同段别组合的逐孔起爆方案,识别了各孔段振动速度波形,比较了各方案各孔段波形峰值.结果表明:间隔一至两个段别的微差方式更有利于应力波干涉减震;对于多孔段逐孔爆破,统一地改变孔间间隔时间往往不达到整体减震的目的;对于梅山铁矿的爆破参数,起爆段别调整为1-3.-4-5-6-8-9-10-11段更有利于爆破振动效应的控制.针对模拟得出的最优方案进行了现场对比验证,现场试验表明:相对于原方案,优化后方案井下减震11.4％,地表减震15.2％,说明优化方案具有一定的应用价值.
Abstract
Meishan iron mine is a typical “urban mine”,it is very important to control its blasting vibration effects to ensure the safety of surrounding buildings.In order to optimize millisecond parameters and reduce blasting vibration effects,a blasting model for quasi two-dimensional fan-shape deep holes was built with LS-DYNA.On the basis of the current typical millisecond blasting parameters,five different millisecond patterns for hole by hole initiation were designed,the vibration velocity waveform of each hole in different patterns were identified,and their peaks were compared.Results showed that the reasonable blasting delay time of each hole should be 25ms ～50ms to reduce blasting vibrations due to stress wave interference;for multi-hole hole by hole initiation,the whole vibration reduction can't be achieved only with uniformly changing blasting delay time of each hole;for blasting parameters of Meishan iron mine,the detonator group 1-3-4-5-6-8-9-10-11 is more appropriate to control blasting vibration effects.Besides,field comparative test was conducted,the results showed that compared with the original blasting scheme,blasting vibrations caused with the optimized pattern 5 are reduced by 11.4％ underground and 15.2％ on surface,so the optimized pattern has a certain applicable value.
关键词
爆破振动/扇形中深孔/多孔段波形/段别组合/LS-DYNAKey words
blasting vibration/fan-shape deep holes/multi-hole blasting waveform/millisecond parameters/LS-DYNA引用本文复制引用
出版年
2017
NETL
NSTL
维普
万方数据