王军宏;张万生;
WANG Jun-hong;ZHANG Wan-sheng;Gansu Xigou Mining Co.,Ltd.,JISCO Group;

• 1:酒钢集团甘肃西沟矿业有限公司

摘要(Abstract)：

露天矿采区内的溜井,随开采台阶面的下降需要降段。甘肃某露天矿山采区内的3#、4#溜井,其溜井深度均在400m以上,且区域地质结构复杂,井壁采用800mm厚钢钎混凝土支护,降段技术要求高、施工难度大,不能采用以往的以溜井口为自由面进行爆破降段,据此提出了一种先通过掘沟爆破为溜井降段提供自由面,再采用预裂爆破技术保护溜井支护体的完整性,最后通过深孔爆破和浅孔爆破相结合,完成溜井全降段的综合性降段技术。实践应用表明,该综合技术不仅满足了安全生产要求,而且取得了良好的爆破效果和经济效益。
A chute in an open pit mine area need to be descended as the level of mining steps decreases.For the 3# and 4#chute in a open-pit mine mining area in Gansu,the depth of the chute is all above 400 m,and the regional geological structure is complex.800 mm thick steel brazed concrete support is used for the borehole wall,the technical requirements for descending are high and the construction is difficult,and it is impossible to use the previous situation in which the wellhead is used for blasting descending the free surface.Trenching blasting is proposed to provide a free surface for the chute descending,then use pre-splitting blasting technology to protect the integrity of the chute supporting body,finally,through the combination of deep hole blasting and short-hole blasting technology,to complete the comprehensive descending technology for the chute.The practical application shows that this technology not only satisfies the safety production requirements,but also achieves good blasting results and economic benefits.

关键词(KeyWords)： 露天矿;高深溜井;降段技术;掘沟爆破;预裂爆破
open-pit mine;high-deep chute;descending technology;trench blasting;pre-split blasting

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 王军宏;张万生;
WANG Jun-hong;ZHANG Wan-sheng;Gansu Xigou Mining Co.,Ltd.,JISCO Group;

参考文献(References)：

• [1]吕向东,魏炳,马小兵.西沟石灰石矿在降段与掘沟爆破中的经验[J].工程爆破,1998,4(2):42-46.LYU X D,WEI B,MA X B.The experience on blasting of cutting bench and digging trench in Xi Gou limestone mine[J].Engineering Blasting,1998,4(2):42-46.
• [2]吴建华.露天矿主溜井降段方法及防止堵塞跑矿的对策[J].冶金矿山设计与建设,1995(5):35-39.WU J H.Stepping-down of main orepass and prevention of ore plugging and slip-fiow in open pit[J].Metal Mine Design&Construction,1995(5):35-39.
• [3]王清,郝利军,李富田.白云铁矿主采场掘沟工程技术研究和创新[J].包钢科技,2016,36(3):42-44.WANG Q,HAO L J,LI F T.Technical research and innovation of ditching engineering in main stope of Baiyunebo iron mine[J].Science and Technology of Baotou Steel,2016,36(3):42-44.
• [4]伍绍泽.兰尖铁矿爆破降震技术研究[J].金属矿山,2003(12):18-19.WU S Z.Investigation of blast-induced vibration reducing technology at Lanjian iron mine[J].Metal Mine,2003(12):18-19.
• [5]丁建勇,刘敬国,许道刚,等.卡布其露天矿6#溜井及风井降段方案研究[J].煤炭技术,2014,33(12):45-47.DING J Y,LIU J G,XU D G,et al.Study of open pit mine chute and wind 6#kapoor well drop period[J].Coal Technology,2014,33(12):45-47.