提高炮采工作面块碳率的微差爆破技术及安全措施

在分形几何理论和岩石细观损伤机理的基础上,通过改变不耦合系数、炸药单耗和填塞条件等参数,在实验室进行模拟爆破实验,以优化爆破参数和实现对爆破块度的控制和预测。针对永城煤电集团公司陈四楼煤矿三个炮采工作面的具体情况,对炮采工作面实施微差爆破技术,确定了软煤体、片帮和破碎顶板条件下合理的爆破参数,并提出了炮采工作面微差爆破的安全技术措施;在安全、高效的前提下,块碳率提高了6%～10%,单产增加18 8%。

MILLISECOND BLASTING TECHNOLOGY USED TO RAISE LUMP COAL RATIO OF COAL FACE AND SAFETY MEASURES

Based on fractal geometry theory and rock microscope damage mechanism,blasting simulation is performed by changing blasting parameters such as uncoupling coefficient,powder factor and stemming length.As a result,control and prediction of coal fragmentation are achieved by optimizing blasting parameters above mentioned.According to the conditions of three coalfaces in Chensilou Coal Mine,Yongcheng Mining and Electricity Group,the millisecond delay blasting technology is used in site.The optimized blasting parameters suitable to the conditions of soft coal mass,side fall of coalface and broken roof are determined and the safety measures for the millisecond delay blasting in coalface are presented.The lump coal ratio has been raised from 6% to 10% and the production is increased by 18.8% under the conditions of safety and high production.