Abstract: The cutting shaft construction by shallow drilling based on 7655 drilling machine is the common method for sublevel caving mining operation,but the shortcomings such as high labor intensity,low efficiency are existed,beside that,the operation safety cannot be ensured.In order to reduce the labor intensity of the construction of cutting shaft and ensure operation safety,according to the geological characteristics and technical conditions of Beiminghe Iron Mine,one blasting shaft excavation technique based on medium—length drilling and hole segmented blasting by domestic 8920 drilling trolley and SIMBA H1354 medium—length drilling trolley instead of 7655 drilling machine is proposed.By verification of field test results,the construction period is shortened by 4 days,the labor efficiency is improved,and average caving height is higher than 8 m by using the technique proposed in this paper.According to the calculation results of the construction of 15 cutting shafts of the mine,about 119 800 yuan can be saved.The technical support for the goal of reducing costs and increasing efficiency of the mine is provided.The one blasting shaft excavation technique is worth applying in the whole mine.

Key words: Sublevel caving mining method, Drilling trolley, Hole sublevel, Shaft excavation by once time