分阶分段直眼掏槽

通过模拟试验讨论了同深和不同深分阶分段直眼掏槽、单孔爆破漏斗特性以及远距离小空孔在掏槽爆破中的作用等问题，比较了不同孔距和装药量条件下的多孔爆破漏斗特性以及多孔爆破与单孔爆破的漏斗特性，分析了保证分阶分直眼掏槽效果的基本条件。

VERTICAL BOREHOLE CUT BLASTING IN STEP AND IN STAGE

Based on the model tests,the cut with vertical boreholes which has the same depthor not,arranged in multi steps and detonated in multi stages to free face,the characteristic of blast funnel created by a vertical blasthole to free face and function of small empty hole far away from the blasthole in cut blasting and so on are discussed in this paper.The blast funnel characteristics of multi blastholes are compared under the condition of different spacings and charge weights,and the blast funnel characteristic of multi blastholes are compared with that by a blasthole.The basic condition for gaining good vertical blasthole cut effects is put forward.