某铀矿上向水平分层开采高度优化研究  

Optimization for Mining Height of Upward Horizontal Slicing Mining in a Uranium Mine

作　　者：杨江坤 孙刚友 任赛 YANG Jiangkun;SUN Gangyou;REN Sai(China Nuclear Mining Science and Technology Corporation,CNNC,Beijing 101149,China)

机构地区：[1]中核矿业科技集团有限公司,北京101149

出　　处：《铀矿冶》2024年第4期33-43,共11页Uranium Mining and Metallurgy

摘　　要：以某铀矿床采场为研究对象,基于矿体特征及工程经验,选定该区域采用上向水平分层充填采矿法开采。利用FLAC3D建立了不同采场结构参数的开采方案模型,对采场开采-回填过程进行数值模拟,分析了采场的应力场、位移场和塑性区的时空演化特征,研究了采场的稳定性。结果表明,当矿体的水平分层高度为2 m时,安全稳定性较好,在开采前期对顶板位移量的控制效果更好;在开采作业时,采场的应力集中区域逐渐扩大,采区顶部和底部有明显的应力贯通区;在回填时,充填体内的压应力分布较均匀,压应力较小,且后期的应力变化幅度不大;巷道与采场交接处位移量最大,在开采回填作业前期位移量增长速率较快,并出现近垂直式跳跃增长;巷道中段及采场中段顶板处的位移量呈阶段性变化,总体位移量较小。Taking the stope of a uranium mine as the research object,based on the characteristics of the ore body and existing engineering experience,the upward horizontal slicing mining method is selected.The mining scheme model with different stope structural parameters is established by using the numerical method of FLAC3D.Through the numerical simulation of the stope mining and backfilling process,the temporal and spatial evolution characteristics of the stope stress field,displacement field and plastic zone are analyzed.The stability of stope is studied.The results show that the horizontal stratified height of 2 m is safer and more stable than 4 m,especially in the early mining period.With the development of mining operations,the stress concentration area of the stope gradually expands,and there are obvious stress areas through the top and bottom of the mining area.With the progress of backfill,the distribution of compressive stress inside the backfill body is more uniform,showing a small compressive stress,and the stress change amplitude is not large in the later period.The displacement at the intersection of roadway and stope is the largest,and in the early stage of mining backfill operation,the growth rate is fast and the near-vertical jump growth occurs.The displacement changes at the middle part of roadway and the top plate in the middle part of stope show phased changes,and the overall displacement is small.

关 键 词：铀矿床 上向水平分层充填采矿法 采场结构参数 数值模拟 稳定性分析 FLAC3D 

分 类 号：TL212.1[核科学技术—核燃料循环与材料] TD868[矿业工程—金属矿开采]