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矿物晶体颗粒使岩石断裂路径产生分形，而爆破裂缝宏观扩展速度及爆破块度分布又决定爆破破碎时间。运用分形理论，研究了岩石孔隙率对断裂速度的影响，分析岩石爆破的破碎过程，建立了岩石爆破破碎时间的计算方法。
Mineral crystal particles fractured rock fracture path, and the macroscopic propagation speed of blasting cracks and the distribution of blasting fragmentation also determine the blasting time. Fractal theory is used to study the effect of rock porosity on fracture speed. The crushing process of rock burst is analyzed and the calculation method of rock blasting crushing time is established.