【摘要】 临近采空区多段毫秒微差爆破的微差时间选取直接关乎采空区顶板的稳定性。为了探究临近采空区毫秒延时爆破最优微差间隔时间,在分析总结国内外实际生产中选取的微差间隔时间的基础上,将某地下矿山实际开采情况简化为花岗岩介质中采空区附近2个柱形耦合装药炮孔研究模型,并从计算机模拟的角度,运用ANSYS/LS-DYNA有限元动力分析程序对微差间隔时间分别为0 ms/m、3 ms/m、5 ms/m、7 ms/m、8 ms/m的毫秒微差爆炸过程分别进行数值计算,得到了爆炸过程中采空区顶板观测点的振动速度-时间曲线及振速峰值。分析结果表明:微差间隔时间为28 ms,即7 ms/m时干涉减振效果最优。更多还原

【Abstract】 The blasting delay time directly affects the stability about the roof underground. In order to study the optimized interval time of blasting near underground goaf,a mathematical model of millisecond delay time blast in granite with 2 blast holes was established based on the analysis of practice production interval time at home and abroad. Using the computer simulation,the process of the blast delay time with 3 ms / m、5 ms / m、7 ms / m、8 ms / m were simulated based on ANSYS / LS-DYNA,by which the curve of time-velocity was obtained. The results show that the delay interval time with 28 ms was optimum.更多还原