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为有效应用深孔控制爆破技术防治煤与瓦斯突出等事故,首先利用ANSYS/LS-DYNA软件建立有控制孔和无控制孔2种数值模型,进行煤层爆破数值模拟;其次在实验室建立有控制孔和无控制孔2种物理模型,开展爆破模拟试验;然后通过理论分析爆炸应力波入射控制孔的反射规律,揭示深孔控制爆破控制孔的作用机制。数值模拟、爆破模拟试验和理论分析等研究共同表明:增设的控制孔在煤层深孔控制爆破中将入射的压缩应力波反射为拉伸应力波而产生拉伸作用,有明显的控制导向作用和对其他方向裂隙发育的抑制作用。
In order to effectively apply the deep hole controlled blasting technology to prevent accidents such as coal and gas outburst, two kinds of numerical models with control holes and non-controlled holes were firstly established by using ANSYS / LS-DYNA software to simulate the blasting of coal seam. Secondly, Hole and uncontrolled hole. The theoretical analysis of the reflection law of blasting stress injection control hole reveals the mechanism of control hole in deep hole controlled blasting. Numerical simulations, blasting simulation tests and theoretical analysis show that the additional control holes reflect the incident compressive stress waves into tensile stress waves in the deep-hole controlled blasting of coal seam, resulting in a tensile effect with obvious control-oriented action and Inhibition of fissure development in other directions.