关键词: 组合式崩落法, 空场法, 地压应力, 补偿空间, 底部堑沟出矿

Abstract: 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.

Key words: Combined caving method, Open stoping, Geostress, Compensating space, Trench-shaped sill pillar