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铁矿开采工艺的改进与合理地采用井下大爆破方法有直接关系。这种大爆破总装药量达500t以上,同时崩落的矿石体积超过40～50万m~3。爆破产生的空气冲击波,距装药点5～10m的余压为6200kPa以上,传播速度为3000m/s以上。当分支巷道网的矿井产量很大时,存在连通地表的有效崩落带,因此,紧挨回采区有时需要安设固定式通风装置,这给采区大爆破时通风装量的保护带来一定的复杂性。在保护固定式通风装置免受大爆破的空气冲击波影响方面,“西伯利亚”和“联盟”矿联合企业积累了丰富的经验。
The improvement of iron ore mining process is directly related to the rational use of the underground blasting method. This large blasting of the total charge of more than 500t, while the ore volume of more than 40 ~ 500,000 m ~ 3. Blasting air shock wave from the loading point 5 ~ 10m residual pressure of 6200kPa above, the propagation speed of 3000m / s or more. When the output of mine roadway network is very large, there is an effective avalanche zone connecting the ground surface, so close to the mining area sometimes need to install a fixed ventilation device, which brings a certain amount of protection Complexity. The “Siberian” and “Union” mines have a wealth of experience in protecting stationary ventilators from the blast of air blasting.