Study and Safety Evaluation on Chamber Blasting of Mined-Out Area in Pao-Maping Mine

A comprehensive study on topographical and geological conditions, current situation of exploration, storage characteristics of the mined-out areas, and the environment condition of the mine in Pao-Maping Mine was carried out. The millisecond controlled blasting technology was utilized to weaken the influence to the surface building and underground facilities induced by the explosion. Additionally, impact caused by shock wave on the critical facilities in the mine was assessed systemically. Simultaneously, the mine ventilation system should be entirely tested and maintained before blasting, to ensure the mine restoration production after the chamber bursting. Besides, safety test should be conducted on the poisonous gas in the mine after the chamber blasting.