堵塞长度对巷道掘进掏槽爆破效果影响研究Study of Influence of Stemming Length on Cutting Blasting Effect in Tunnel Excavation
任少峰,余红兵,赵明生,陶铁军,尚钰姣
摘要(Abstract)：
巷道爆破掘进过程中过短或过长的炮孔堵塞都会对爆破效果和施工进度造成不良影响。为获得某金矿爆破掘进最优掏槽炮孔堵塞长度,采用了ANSYS/DYNA数值仿真软件模拟了不同堵塞长度(0 cm、10 cm、20 cm、30 cm、40 cm、50 cm、60 cm)下的爆破施工,分析了相应的炮孔不同位置处岩体应力变化曲线,并进行了不同堵塞长度的爆破效果试验,对比不同工况下的大块率、炮孔利用率等爆破效果。试验结果表明:对比峰值应力获得了最优的堵塞长度为30 cm,实际工况下堵塞长度为30~40 cm时爆破效果是最好的,得到了爆破质量随堵塞长度变化的规律,过长或过短的堵塞都会引起不良爆破效果。
关键词(KeyWords)： 堵塞长度;巷道掘进;数值仿真;爆破效果;掏槽爆破
基金项目(Foundation): 黔科合重大专项[2015]6003;; 黔科合高G字[2015]4004;; 贵州省工业和信息发展专项基金(2015030)
作者(Author): 任少峰,余红兵,赵明生,陶铁军,尚钰姣
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