Influence of blasting vibration near main shaft on its stability in Xincheng Gold Mine

Rock drilling and blasting method is used for mining preparation, cutting and mining operations in most metal mines, and evaluates the impact of blasting vibration on the stability of nearby existing projects (especially the main development roadway) is of great significance for the safety of mine production and construction.Near the main shaft of Xincheng Gold Mine, the ore body needs to be mined and the section of blind shaft needs to be enlarged.In order to ensure the stability of the main shaft, the blasting related parameters for ore body mining and blind shaft section enlargement are theoretically analysed.Combined with the blasting vibration attenuation law obtained from field monitoring and numerical simulation based on FLAC^3D, the influence of blasting vibration of ore body mining and blind shaft cross-section enlargement on the stability of the main shaft is evaluated.Based on the results of theoretical analysis, field monitoring and numerical simulation, it is found that under the current blasting parameters of Xincheng Gold Mine, if the ore body mining and blind shaft section enlargement are carried out within 50 m from the main shaft, the blasting vibration effect will not affect the stability of the main shaft when the number of allowed simultaneous blasting stopes and the maximum explosive amount are no more than 15 and 1 250 kg respectively.This method provides a feasible means for rapid evaluation of blasting vibration and preliminary design of blasting parameters.