摘要
为了实现七角井铁矿急倾斜中厚矿体的安全回采,设计了阶段空场嗣后膏体充填法,并采用FLAC3D对开采和充填前后的采场稳定性进行了数值模拟。结果表明:分段凿岩、阶段出矿及低强度膏体充填适用于稳固型的急倾斜中厚矿体开采,矿石回收率82%,贫化率8%,矿块生产能力900~1 200t/d。膏体充填以全尾砂、干抛尾、水泥、粉煤灰为主要原料,充填体浓度77%~79%,灰砂比1∶30~1∶15。采场在不充填条件下难以维持长期稳定,膏体充填控制了矿柱水平位移,减缓了顶板下沉及应力集中,有效维护了采场安全性。
To realize the safe mining of steep inclined medium-thick orebody at Qijiaojing Iron Mine, stage open stoping with subsequent paste backfill was designed, and numerical simulation of stope stability before and after both mining and backfill was carried out on the basis of FLAC^3D. The results show that the combination of sublevel drilling, stage ore delivering and paste backfill with low strength is suitable for mining of stable steep inclined medium-thick deposit. With this method, 82% recovery, 8% dilution and 900~1 200 t/d production capacity are achieved. The paste backfill materials mainly consist of unclassified tailings, waste rocks, cement and fly ashes. The paste concentration is design as 77%~79%, and cement-sand ratio ranges from 1 ： 30 to 1 ： 15. Moreover, the stope failed to stay stable in the long term in the absence of backfilling, and the paste backfill controls the horizontal movement of pillars, minimizes the roof settlement and stress concentration, and efficiently enhances the stope stability.
作者
黄明清
王贻明
HUANG Mingqing1 , WANG Yimingz(1. College of Zijin Mining, Fuzhou University, Fuzhou 350108, China; 2. School of Civil and Resource Engineering, University of Science and Technology P, eijing, Beijing 100083, Chin)
出处
《有色金属（矿山部分）》
2018年第2期9-14,共6页
NONFERROUS METALS(Mining Section）
基金
中国博士后科学基金项目(2017M610773)
国家重点研发计划"深地资源勘查开采"重点专项(2017YFC0602900)
国家自然科学基金项目(51674012)
关键词
急倾斜中厚矿体
阶段空场嗣后充填法
膏体充填
数值模拟
steep inclined medium-thick deposit
stage open stoping with subsequent backfill
paste backfill
numerical simulation
