露天深孔梯段爆破后冲破坏的成因及控制

Cause and control of impulsive damage from deep-hole bench-blasting

针对深孔梯段爆破产生后冲破坏的问题 ,通过爆炸力学分析和运动力学分析 ,揭示了爆破后冲破坏的成因和机理 ,认为爆破区抛掷运动对后续工作面的冲击力是岩石发生移动错位的主要原因 .并提出通过改变装药结构 ,优化爆破参数 ,采用微差爆破和预裂爆破技术等措施可以控制后冲破坏作用 ,保护边坡稳定 ,改善梯段爆破效果 .

Through analyzing the problem of impulsive damage of deep hole bench blasting with explosive kinetics and mechanics methods, the cause and mechanism of impulsive damage are revealed. It is considered that the force to following faces of rocks moving is the main cause. This force makes the followed rocks move and dislocate. To adopt measures of changing the charge patters and optimum blasting parameters and use millisecond blasting and pre splitting blasting, the impulsive damage from deep hole bench blasting could be controlled and the edge slopes could be kept stable.