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在大量现场实验基础上选择有代表意义的实际工程为背景,利用三维数值模拟方法,建立了较合理的煤--岩介质穿层爆破计算模型,获得不同位置抽放孔有效应力随时间的变化规律,分别探讨了各特定位置有效应力随距离增加而衰减的差异.计算结果表明:在计算模型条件下,复合介质孔口煤层和孔底煤层中爆破击穿范围分别为1.4和1.8 m;孔底由于受应力波的叠加和反射双重作用影响,在相同距离时孔底有效应力平均值较孔口大73%;煤--岩复合介质中煤层爆破效果优于单煤层爆破效果,在同等情况下,复合介质煤层中孔口处有效应力极值较单煤层增加17%～42%,孔底增加6%～24%.
Based on a large number of field experiments, a representative representative of the actual project as the background, the use of three-dimensional numerical simulation method to establish a more reasonable coal-rock media through layer blasting calculation model to obtain different positions of drainage holes effective stress with time The differences between the effective stresses and the attenuation of the effective stress at each specific position with increasing distance are discussed respectively.The calculated results show that the blasting breakdown ranges are 1.4 and 1.8 m At the same time, the effective stress at the bottom of the hole at the same distance is 73% larger than the orifice due to the double effect of stress wave superimposition and reflection. The coal blasting effect in coal-rock composite media is better than that of single coal seam blasting. In the same situation , The effective stress of the orifice in composite media is 17% ~ 42% more than the single coal seam and 6% ~ 24% at the bottom of the hole.