摘要
在红黏土层中进行巷道掘进作业时,采用钻眼爆破施工工艺经常遇到钻孔困难、炮孔参数设计要求严格、掘进速度慢等问题,基于此分别对红黏土层中的钻眼成孔和爆破机理进行分析研究。通过改进钻眼成孔机具,采用EZ1-21/2手持式气动钻机配梅花钻头和麻花钻杆进行成孔作业,大幅加快了成孔质量和速度;通过优化炮眼排列、角度、深度、装药量等爆破参数和采用两次两段微差爆破技术,炮眼利用率从原来的70%提高到90%以上,单循环进尺从1.30 m提高到1.75m,拒爆率由24%降到3%左右,而且周边成形效果好,掘进速度有了较大提高。
According to the mine gateway driving operation in red clay,the drilling and blasting construction technique applied would often have the borehole drilling difficulty,the serious requirement of the borehole parameter design,the driving speed low and other problems.The paper had the analysis and study on the borehole drilling and blasting mechanism in the red clay individually.With the improvement of the borehole drilling tools,the EZ1-21/2 hand type pneumatic drill with auger bit and auger rod was applied to the borehole drilling operation and the borehole drilling quality and speed could be highly increased.With the optimization of the borehole pattern,angle,depth,explosive loading and other blasting parameters and the twice and two sectional millisecond delay blasting technology,the utilization rate of the blasting boreholes was improved from previous 70% to over 90%.The driving rate of the single circulation was improved from 1.30 m to 1.75 m.The missed blasting rate was reduced from 24% to about 3%.Thus the profile shape results would be good and the driving speed could be highly increased.
出处
《煤炭科学技术》
CAS
北大核心
2011年第2期26-28,45,共4页
Coal Science and Technology
关键词
红黏土
旋挖成孔
拒爆率
两次两段微差爆破
斜井
red clay
borehole drilled with rotary excavation
missed blasting rate
twice and two sectional millisecond delay blasting
mine inclined shaft
