【作者】 王公忠； 张袁娟； 王幸荣； 王凤凰； 李梅；

【Author】 WANG Gong-zhong;ZHANG Yuan-Juan;WANG Xing-rong;WANG Feng-huang;LI Mei;Department of Safety Engineering,Henan Institute of Engineering;School of Resource and Environment Engineering,Wuhan University of Technology;Hubei Yihua mining limited liability company;

【机构】 河南工程学院安全工程学院； 武汉理工大学资源与环境工程学院； 湖北宜化集团矿业有限责任公司；

【摘要】 针对平煤十一矿回采工作面卸压爆破合理孔径确定问题,基于实验室测定工作面的煤岩体材料参数,结合实际工况,用分析软件LS—DYNA分别对孔径30 mm、40 mm、60 mm和80 mm工况的区卸压松动爆破进行数值模拟。数值模拟结果表明:四种工况下,裂隙半径最大为1.211 m;最大主应力历程曲线随着孔径的增大,爆破作用时间明显增大。通过裂隙半径结合最大主应力分析,得出该煤矿卸压爆破合理孔径为60 mm;根据确定的爆破孔径在现场进行效果考察,工作面前方的应力集中区向深部转移;消除了工作面前方局部应力集中现象。更多还原

【Abstract】 According to the selection of reasonable blast hole diameter in blasting engineering with pressure relief method,compound with laboratory parameters of working face in coal and rock and the actual conditions,different apertures(30 mm,40 mm,60 mm and 80 mm) were established by using LS-DYNA,by which the largest fracture radius was obtained as 1.211 m.Combined with the maximum principal stress history curves with the diameter increasing,the blasting function time increased too.Based on the discussion on the fracture radius and the maximum stress,the optimum borehole diameter for the coal mine was determined as 60 mm.According to the blast effect in the field,the high stress area of the working face tended to move to the depth in rock,which eliminated the phenomenon of local stress concentration near the working face.更多还原