大间距无底柱分段崩落法开采稳定性分析

ANALYSIS OF THE STABILITY OF PILLARLESS SUBLEVEL CAVING IN LARGE SPACE MINING

无底柱分段崩落法的产量在地下铁矿开采过程中占总产量的85%以上,小尺寸的采场结构参数在一定程度上限制了该采矿方法的开采效率,制约矿山经济发展。从放出体空间排列优化、爆堆体与放出体吻合度等角度,对比分析高分段结构和大间距结构两种大结构参数方案在无底柱分段崩落法开采中的适用性,认为大间距无底柱分段崩落法能够大幅降低采掘比,改善采场地压环境,控制矿石损失贫化,降低采矿成本,更有利于提高经济效益。并结合矿山开采实践,采用FLAC3D软件对大间距无底柱分段崩落法进路开采的围岩应力及位移变化进行模拟分析,结果显示安全稳定性满足生产要求,验证了大间距无底柱分段崩落法开采的可行性和经济性。

The output of pillarless sublevel caving accounts for more than 85% of the total output in the mining process of underground iron mine. Small size stope structure parameters to some extent limits the efficiency in the exploitation of the mining methods, restricting the economic development of mine. From the viewpoints of drawn- body spatial arrangement optimization, goodness of fit for drawn-body and blasting pile body, high block structure and large space structure of two kinds of large structure parameter schemes in the application of pillarless sublevel caving mining is comparatively analyzed, pillarless sublevel caving in large space can greatly reduce the extraction ratio, improve the stope ground pressure environment, control ore loss and dilution, reduce the mining cost, and more conducive to improve the economic benefit. Combining with mining practices, the FLAC3D is used for simula- tion analysis of the surrounding rock stress and displacement variation of pillarless sublevel caving in large space mining. The results show that the security stability meets the production requirements, verify that the pillarless sub- level caving in large space mining is feasible and economical.