高应力破裂矿柱阶梯式诱导崩落法回采实践  

Practice of Step-induced Caving Mining in Fractured Pillar with High Stress

作　　者：何晓武[1] 潘桂海 王湖鑫 HE Xiaowu;PAN Guihai;WANG Huxin(Tongkeng Mine,China Tin Group Company Ltd,Hechi,Guangxi 547207,China;Beijing General Research Institute of Mining and Metallurgy Technology Group Co.Ltd,Beijing 102628,China;National Centre for International Research on Green Metal Mining,Beijing 102628,China)

机构地区：[1]广西华锡集团铜坑矿业分公司,广西河池市547207 [2]北京矿冶科技集团有限公司,北京102628 [3]国家金属矿绿色开采国际联合研究中心,北京102628

出　　处：《矿业研究与开发》2021年第7期9-13,共5页Mining Research and Development

摘　　要：铜坑矿以采富留贫的方式对92#矿体进行回采,在高地压应力、多次开采扰动和空区冒落的影响下,预留的大量不规则矿柱大多呈破裂、不完整状态。矿柱群Ⅱ采区是高应力破裂矿柱的典型代表,由于多分层采准工程同时施工,严重削弱了矿柱的完整性,诱发区域性地压活动,大部分采准工程被破坏。针对矿柱群Ⅱ采区采准工程遭地压破坏的情况,通过对地压监测数据、各区域破坏类型进行系统分析,运用原地碎裂爆破技术,对高应力矿柱进行泄压,改善矿柱内部的应力环境,布置阶梯式出矿底部结构,大面积拉底,诱导顶部矿体垮落,实现破裂矿柱诱导崩落,矿石回收率达75%,贫化率为19.5%,取得了良好的开采效果。In the 92# orebody of Tongkeng Mine, the rich ore is mined and the low-grade ore is retained. Under the influences of high ground pressure stress, repeated mining disturbance and goaf caving, a large number of reserved irregular pillars were mostly broken and incomplete. The pillar group II mining area was a typical representative of fractured pillar with high stress. Due to the simultaneous construction of mining preparation engineering in multiple layers, the integrity of pillar was seriously weakened, regional ground pressure activities were induced, and most of the mining preparation engineering was destroyed. In view of this situation, through the systematic analysis on the ground pressure monitoring data and the damage type in each region, by in-situ fragmentation blasting technology, the pressure of the pillar with high stress was relieved, the stress environment inside the pillar was improved, the stepped bottom structure was arranged, large area bottom pulling was achieved, and the top orebody was induced to collapse, so that the induced caving of broken pillars was realized. Finally, good mining effects have been obtained, with ore recovery rate of 75% and the dilution rate of 19.5%.

关 键 词：破裂矿柱 诱导崩落 高应力 原地碎裂 

分 类 号：TD853.3[矿业工程—金属矿开采]