关键词: 矿山爆破, 巷道掘进, 岩体分级, 爆破漏斗试验, 微差延期时间

Abstract: Due to the problems of unreasonable blasting parameters，high explosive consumption，poor formation of the section and little blasting fragments existed in the roadway excavation operation of the northearn part of the southeast mining area of Chambishi Copper Mine，which results in high blasting cost，the chute easily blocked，the safety operation of roadway excavation is threatened seriously.In order to solve the above technical problems existed in the operation of roadway excavation of the mine，rock mass quality stability classification is carried out based on geological survey results，the on-site blasting crater test is conducted，the improvement ideals of blasting control for improving the blasting effects is proposed from the aspects of adjusting the groove method，controlling the detonation delay time and improving the peripheral hole control blasting method.The study results show that:①the rock mass grade of mineralized slate in the mining area is Ⅲ~Ⅳ rock mass，while the upper disc quartzite and the lower disc quartzite are both belong to gradeⅡ rock mass，the basement granite and the lower conglomerates are both belong to grade Ⅱ rock mass，the rock mass conditions vary greatly，so the blasting parameters should be dynamically adjusted according to the rock mass conditions on site；②based on the blasting crater test results，reasonable explosive unit consumption is determined as 1.86 kg/m3 more or less，the current consumption of explosives is obviously high，the optimization space is relatively large；③compared with the vertical hole blasting，the inclined hole slotting blasting has obvious superiority in the number of blasting holes，unit consumption，blasting effect，etc.，it is suitable for conducting inclined hole gutter comparison test；④at present，differential delay time of mine excavation blasting is too long，and the optimization tests with the short differential delay detonator should be conducted；⑤charge structure of the peripheral holes is unreasonable，it is suitable to adjust by the scheme proposed in this paper to improve the blasting control effect of the roadway.The feasibility and reliability of the technical solution will be verified by conducting a multi-program on-site blasting comparison tests，so as to provide guidance for the control of mine roadway blasting quality.

Key words: Mine blasting, Roadway excavation, Rock mass classification, Blasting crater test, Differential delay time