基于LS-DYNA的扇形中深孔逐孔起爆段别优化

发布时间：2018-02-22 21:10

本文关键词： 爆破振动扇形中深孔多孔段波形段别组合 LS-DYNA　出处：《振动与冲击》2017年11期 　论文类型：期刊论文

【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 "city mine", and controlling blasting vibration effect is of great significance to the safety of surrounding buildings. In order to optimize its millisecond parameters and reduce blasting vibration effect, a quasi-two-dimensional model of mid-deep hole blasting with sector shape is established by using LS-DYNA. On the basis of the original typical micro-difference method, five kinds of hole-by-hole initiation schemes are designed, and the vibration velocity waveforms of each section are identified. The results show that the difference between one or two segments is more favorable for the interference of stress wave to reduce the vibration, and for the hole blasting of the porous segment, Changing the interval between holes in a unified way often does not achieve the purpose of overall seismic absorption; for the blasting parameters of Meishan Iron Mine, Adjusting the detonation stage to 1-3-4-5-6-8-9-10-11 section is more favorable to the control of blasting vibration effect. The field comparison and verification of the optimal scheme obtained by simulation are carried out. The field test shows that, compared with the original scheme, The optimized scheme has some application value, which is 11.4 in downhole and 15.2in surface.
【作者单位】：中南大学资源与安全工程学院;
【基金】：国家自然科学基金(51204205)
【分类号】：TD235.4

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