组合式崩落法在铜坑矿92#矿体中的应用研究

92#矿体与91#矿体重叠区域范围大，在91#矿体回采过程中，重叠区域内产生了较多采空区，并且采空区大多冒落而形成了松散的垮落体环境，导致目前92#矿体开采技术条件异常复杂，部分采场面临上中段仅单进路，三面为采空区，中部中段为双进路，下中段为完整进路的特殊开采条件，很难实现单一空场法或崩落法进行回采，并且存在回收率低，容易受地压应力、火烧灰等诸多危险危害因素影响。本研究以92#矿体T106单元作为试验采场，根据矿山常用的崩落法与空场法的开采经验，结合各中段现有开拓工程，运用组合式崩落法提前切断顶部地压应力，最终实现了T106单元的安全高效回采，有效避免了底部矿石回采过程中的地压安全问题，为开采铜坑矿92#矿体类似技术条件的采场提供了一种安全可靠的技术参考。

Application of Combined Caving Method in 92# Orebody of Tongkeng Mine

There are a wide range of overlapping areas between 92# and 91# orebodies.During mining activities of 91# orebody,many goafs were formed in the overlapping area with 92# orebody,which develops a loose collapsed circumstance and causes mining technical condition of 92# orebody be exceptionally complicated due to huge goafs and numerous caving.Some stopes are faced with problems like only one access to stope in upper ore medium levels with goafs on the three sides,two accesses in central levels and whole accesses in nether level,so it is difficult to realize mining with a single open stoping method or caving method,and it may accompany with low recovery ratio and be susceptible to geostress and upper ash.Taking T106 stope of 92# orebody as a test case and with full use of the previous engineering,T106 stope is extracted efficiently and safely by cutting off top geostress with combined caving method based on mining experiences of caving and open stoping method,which ensures mining safety below.It provides a technical reference for other stopes with similar mining conditions as 92# orebody.