Abstract: In order to solve the problems such as low efficiency of excavation and poor safety and so on,taking the excavation ore removal shaft of Shizhuyuan Polymetallic Mine as the study example,well drilling technology by once blasting is proposed.According to the special blasting conditions of the mine,the layout parameters,charging structure and blasting sequence are designed.The practice results show that the application results by using well drilling technology by once blasting is ideal,the chute passes through the upper and lower sections,which is accordance with the design.Compared with the shaft construction by ordinary method,the cost is saved by 30.7％,the time is saved by 58.3％,the economic benefits are significant,the construction period is shortened,and the safety is guaranteed,therefore,the technology proposed in this paper can be used in other similar mines.

Key words: Chute,Well drilling technology by once blasting,Charging structure,Delayed exploding time