The blasting boulder yield is an important quality indicators in the step long-hole blasting of surface mine.
大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
In step long-hole blasting in gently inclined open-mine, which mining along slope direction from top to bottom, the press from next step result great difficult in blasting work.
张店钢铁总厂湖田石矿为缓倾斜露天矿，在由上而下顺倾向采矿的缓倾斜台阶深孔爆破中，下一台阶对爆区有夹制作用，给爆破工作带来很大难度。
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