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针对煤层深孔预裂爆破爆生应力波能量弱、信噪比低的现状,为了给爆孔的装药结构提出合理的改进方案,本文建立了耦合和不耦合装药情况下爆孔孔壁爆炸载荷和透射波能量的计算模型,并利用Matlab软件获得了解析解。同时在淮南矿业集团潘三矿进行了耦合装药系数ξ对爆生应力波能量影响的现场实验,利用改进的基于功率谱的能量分析法对现场实验数据进行分析。理论数值计算及现场实验均表明:应力波总能量随ξ增大而减小;当ξ=1.5时,应力波信号在10~50Hz区间的低频能量最强,信噪比最高,增透效果最佳。
In view of the weak energy and low signal-to-noise ratio of the pre-cracking blasting in the deep-hole coal seam, in order to propose a reasonable improvement scheme for the charge structure of the blasting hole, Explosion load and transmitted wave energy model, and the use of Matlab software obtained analytic solution. At the same time, a field experiment on influence of coupling charge coefficient ξ on the energy of burst stress wave was carried out at Pan 3 Mine of Huainan Mining Group. The experimental data of the field were analyzed by the improved energy analysis method based on power spectrum. Theoretical calculation and field experiments show that the total energy of stress wave decreases with the increase of ξ. When ξ = 1.5, the stress wave has the strongest low frequency energy and the highest signal-to-noise ratio in the frequency range of 10 ~ 50 Hz good.