束状孔双分层孔内延期爆破试验研究
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摘要
束状孔当量球形药包爆破技术是以大直径深孔采矿爆破法为基础发展的一种新型爆破技术,以束状分散装药代替集中装药,装药量一致,爆破效果优于集中装药。但每次爆破会使孔底破碎、堵塞,繁重的清孔工作制约着爆破效率。将一次爆破分层由一个增至两个甚至多个,将使爆破效率成倍增加。将束状孔爆破与孔内延期爆破相结合,进行了双分层爆破试验。结果表明,两段装药延期50ms或75ms起爆时,双分层一次爆破成为可能,提高了束状孔爆破效率2倍。
The bunch-hole equivalent spherical cartridge blasting technology is a new kind of blasting technique based on the vertical crater retreat mining blasting method.It has the same charging amount with the concentrated charging structure but a better blasting effect,causing the bunch-hole dispersed,charging structure was used instead of concentrated charging structure.However,the blasting efficiency was seriously restricted by the clearing work,causing the borehole bottom fractured and plugged every after one time of blasting.The blasting efficiency will be increased as by multiplication if two or more sublevels are blasted in one time of blasting.The bunch-hole structure blasting and in-hole delay blasting were combined and a double sublevels blasting experiment was done in this paper.The results indicated that double sublevels in one time of blasting was conceivable and the bunch-hole blasting efficiency was doubled when the delay of the two decked charging was set to 50 ms or 75 ms.
The bunch-hole equivalent spherical cartridge blasting technology is a new kind of blasting technique based on the vertical crater retreat mining blasting method.It has the same charging amount with the concentrated charging structure but a better blasting effect,causing the bunch-hole dispersed,charging structure was used instead of concentrated charging structure.However,the blasting efficiency was seriously restricted by the clearing work,causing the borehole bottom fractured and plugged every after one time of blasting.The blasting efficiency will be increased as by multiplication if two or more sublevels are blasted in one time of blasting.The bunch-hole structure blasting and in-hole delay blasting were combined and a double sublevels blasting experiment was done in this paper.The results indicated that double sublevels in one time of blasting was conceivable and the bunch-hole blasting efficiency was doubled when the delay of the two decked charging was set to 50 ms or 75 ms.
引文
[1]孙忠铭,陈何,王湖鑫.束状孔等效直径当量球形药包大量落矿采矿技术[C]//2006金属矿采矿科学技术前沿论坛.2006:4-6.
[2]冯盼学,陈何.束状孔爆破应力场的超动态应变试验研究[J].矿冶,2011,20(3):33-35,71.
[3]崔新男,陈何.束状孔与等效单孔爆破效果数值模拟对比研究[J].有色金属(矿山部分),2013,65(1):94-100.
[4]吴姗,陈何,孙宏生,等.大红山铜矿束状孔采矿及爆破振动监测技术[J].有色金属工程,2015,5(增刊1):126-129.
[5]刘建东,王湖鑫,陈何,等.煤矿岩巷束状孔掏槽爆破掘进试验研究[J].中国矿业,2016,25(1):103-106.
[2]冯盼学,陈何.束状孔爆破应力场的超动态应变试验研究[J].矿冶,2011,20(3):33-35,71.
[3]崔新男,陈何.束状孔与等效单孔爆破效果数值模拟对比研究[J].有色金属(矿山部分),2013,65(1):94-100.
[4]吴姗,陈何,孙宏生,等.大红山铜矿束状孔采矿及爆破振动监测技术[J].有色金属工程,2015,5(增刊1):126-129.
[5]刘建东,王湖鑫,陈何,等.煤矿岩巷束状孔掏槽爆破掘进试验研究[J].中国矿业,2016,25(1):103-106.