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介绍了利用深孔控制预裂爆破技术提高∏放工作面放顶煤回收率的试验,并在试验中对预裂爆破前后顶煤运移情况、顶煤回收率进行了考察,试验说明,深孔控制预裂爆破对提高顶煤回收率具有明显的效果。
This paper introduces the experiment of using deep hole to control presplitting blasting technology to improve the recovery rate of top coal in Π working face and examines the movement of top coal before and after presplitting blasting and the top coal recovery rate. Pre-cracking hole control burst to improve the top coal recovery has obvious effect.