深凹露天矿山挂帮矿安全回采工艺研究及实践  

Research and Practice on Safe Mining Technology of Hanging Wall Ore in Deep Open-pit Mine

作　　者：李得 李翠 刘磊[2] 孙明志 覃陆均 LI De;LI Cui;LIU Lei;SUN Mingzhi;QIN Lujun(Pangang Group Mining Co.,Ltd.,Panzhihua 617000,China;Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]攀钢集团矿业有限公司,四川攀枝花617000 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山243000

出　　处：《金属矿山》2024年第4期7-13,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:11862010);“十四五”国家重点研发计划项目(编号:2022YFC2904101)。

摘　　要：为充分回收挂帮矿资源,根据攀西某深凹露天矿山挂帮矿赋存条件及内排土堆排情况,本文提出“内排土连续回填、挂帮矿分步回采”工艺。利用内排土修筑临时道路至回采平台,为回采工作创造设备运转空间;同时连续回填采坑,缩短挂帮矿回采完成后边坡暴露时间。采用靠帮预裂爆破,控制单响起爆药量在250 kg以下,使用等效载荷加载于回采区域,经计算,边坡最大振动速度1.6 cm/s,满足边坡安全速度要求。建立边坡三维模型,计算了回采工艺全过程中边坡位移变化情况,回采完成后边坡整体位移均小于0.5 cm,不会出现大范围边坡失稳。经现场实际应用,累计采出矿石超过58.34万t,且边坡稳定。为矿山下一步全面回采挂帮矿资源提供技术支撑,可供类似矿山参考借鉴。In order to fully recover the hanging wall ore resources,according to the occurrence conditions of hanging wall ore in a deep open pit mine in Panxi and the situation of internal dumping,this paper puts forward the technology of"continuous backfilling of internal dumping and step-by-step mining of hanging wall ore".The temporary road is built to the wide platform by using the inner dump to create the equipment operation space for the mining work.At the same time,the continuous backfilling of the mining pit shortens the exposure time of the slope after the mining of the hanging wall ore.The pre-splitting blasting is used to control the single sound initiation charge below 250 kg,and the equivalent load is loaded in the mining area.After calculation,the maximum vibration speed of the slope is 1.6 cm/s,which meets the safety speed requirements of the slope.The three-dimensional model of the slope is established,and the change of the slope displacement in the whole process of the mining process is calculated.After the completion of the mining,the overall displacement of the slope is less than 0.5 cm,and there will be no large-scale slope instability.The field application shows that the cumulative output of ore is more than 583.4 thousand tons,and the slope is stable.It provides technical support for the next step of comprehensive mining of hanging wall ore resources,which can be used for reference by similar mines.

关 键 词：深凹露天矿山 内排土 挂帮矿 安全开采 边坡稳定 

分 类 号：TD845[矿业工程—煤矿开采]