关键词: 大直径深孔, 采场爆破, 不耦合装药, 岩体稳固性

Abstract: The large-diameter long hole mining methods are used at Tonglushan Copper-Iron Mine.Frequent rock-falls within stopes for many years have interrupted production and brought great ore loss and pollution.The investigation showed that the bad rock and unreasonable drilling and blasting were the main inducing factor of stope collapse.For this，VCR blasting was changed into the lateral retrogressive millisecond control blasting with charging weakened，and the decouple charging method was adopted for the holes with instable rock mass and stope sides.The in-hole propagation of detonation showed that the propagation distance of the decouple charging blasting could be over 6 m.Without denotation，the next charging can be blasted directly.By this way，two small sections of charging can be merged into one section.This method simplifies the charge structure，and it is convenient for implementing the charging process.To reduce the blasting dust and the waste rocks transport，the water-seal blasting was adopted in tests.Good expected results were obtained through the trial at 7313 stope in the past one year，and all of the collapse problems above in the mine were solved in the later by applying the new methods.

Key words: Large-diameter long hole, Stope blasting, Decouple charging, Stope stability