露天煤矿爆破块度特征分析  

Analysis of Blasting Fragmentation Characteristics in Open-Pit Coal Mine

作　　者：杨洋 吕文伟 YANG Yang;LYU Wenwei(Haerwusu Open-pit Coal Mine,China Shenhua Energy Company Limited,Ordos 010300,China)

机构地区：[1]中国神华能源股份有限公司哈尔乌素露天煤矿,内蒙古鄂尔多斯010300

出　　处：《煤矿安全》2020年第11期269-273,280,共6页Safety in Coal Mines

摘　　要：露天煤矿爆破块度分布是资源开采效率的重要影响因素。为明确爆破作用下煤岩块度分布特征,利用分离式霍普金森压杆(SHPB)试验系统进行冲击载荷作用下试样破坏试验,运用直接筛分法分析试样破坏块度分布、分维特征,以哈尔乌素露天煤矿煤层爆破为工程实例,通过图像识别方法获取爆破后块度分布信息,分析其块度分布、分维特征。通过室内试验及生产现场数据分析。结果表明:随着冲击荷载的增加,试样平均粒径逐渐减小,平均粒径变化速率逐渐变小;距炮孔越近的区域煤层破坏愈加严重,且爆破块度越小。The distribution of blasting fragmentation in open pit coal mines is an important factor influencing the efficiency of resource mining.To clarify the distribution characteristics of coal rock mass under blasting,we use a Split Hopkinson Pressure Bar(SHPB)test system to perform specimen failure test under impact load,and use direct sieving method to analyze the distribution and fractal dimension characteristics of sample damage.Taking the blasting of coal seam in Haerwusu Open-pit Coal Mine as an example,we obtain block distribution information after blasting by image recognition method,and analyze its fragmentation distribution and fractal dimension characteristics.Through indoor testing and production field data analysis,the results show that:as the impact load increases,the average particle size of the sample gradually decreases,and the average particle size change rate gradually becomes smaller;the coal seam damage is more and more severe in the area closer to the blast hole,and the smaller the blasting block.

关 键 词：露天煤矿 爆破块度 分布特征 分维特征 冲击载荷 

分 类 号：TD235.46[矿业工程—矿井建设]