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在钻孔内进行爆破,因客观条件所限,与一般爆破作业有所不同。(一)钻孔径多在200毫米以下,致使装药几何形状细长,不利发挥炸药的威力;(二)孔内爆破点处位较深,两端封孔较难,爆炸能量损失大;(三)钻孔内往往有水,要求爆破器材具有良好的抗水性能。开滦六○二厂自1971年以来,在各种钻孔内进行过数十次爆破,今就实践经验总结如下。按作业性质,可分下列四种:
Blasting within the borehole is somewhat different from the normal blasting operation due to the objective conditions. (1) If the drilling diameter is more than 200 mm, the geometry of the charge is slender and unfavorable to the dynamite; (2) The location at the blasting point in the hole is deeper and the sealing at both ends is more difficult and the energy loss of the explosion is large; (C) drilling often water, blasting equipment required good water resistance. Kailuan No. 600 Plant has been conducting dozens of blasting operations in various boreholes since 1971, and its practical experience is summarized as follows. According to the nature of operations, can be divided into the following four: