In response to the problem of thick and hard roof strata of the 3#coal seam in Nanyang Coal Industry Co.,Ltd.,which are not easy to collapse,it was proposed to arrange blasting holes at the same time in the cutting and mining roadways to weaken the roof strata through blasting.The blasting scheme and blasting hole parameters were determined by theoretical analysis and numerical simulation,and field tests were carried out at 3203 fully mechanized caving face of Nanyang Coal industry Co.,Ltd.The results show that the caving effect of roof strata is good,the caving property of top coal is obviously improved,and the recovery rate of top coal is up to 86%.
关键词
综放工作面/坚硬顶板/顶板弱化/顶煤回收率
Key words
fully mechanized caving face/hard roof/roof weakening/recovery rate of top coal
维普
万方数据