Abstract: Through the application of technical research in a mining enterprise,the subsection backfill mining method is adopted to replace the horizontal layer-up backfill mining method with low efficiency and high labor intensity in the ore storage area where the mining conditions are met,and the medium-length hole pre-splitting blasting technology is introduced.Through the pre-splitting blasting design and field blasting test,the suitable design scheme of medium and deep hole pre-splitting blasting is determined.The successful application of this blasting scheme not only plays a key role in the smoothing and stability of the rock walls on both sides of the mining room after mining,but also ensures the safety of personnel and equipment,and is beneficial to improve the operating efficiency of enterprises,and more in line with the development concept of modern enterprise with people-oriented,environmental protection and safety.

Key words: Medium-length hole blasting, Mining method, Presplitting blasting, Surrounding rock control