Abstract:By using the LS-DYNA 3D nonlinear dynamic finite element software,the elasticity calculation model was established to analyze the generation and transmission of stress under explosive charge in 4 typical cutting patterns,those used in shaft excavation by one-step blasting were optimized and compared by numerical simulation to select the optimizing cutting patterns. The 4 typical cutting patterns are:9-hole cut,single-spiral-hole cut,double- spiral-hole cut,and 2-empty-hole-diamond cut. LS-DYNA 3D nonlinear dynamic finite element software was applied to simulate the shaft excavation by one-step blasting to achieve the generation and transmission mechanism of stress wave,which would be helpful for selecting the best cutting pattern. The simulation results showed that the single-spiral-hole cut was the optimum cutting pattern according to the related parameters such as the maximum generating time of stress,the generating time of stress around the empty holes,the action time of available stress,and the maximum velocity of node and the penetrating time of stress. The research results of numerical simulation have been proved by field productive application. The bottleneck problems referring to the blasting parameters in shaft excavation by one-step blasting have been solved. This research presented a scientific and reasonable theory for the underground engineering and would have the wide application prospect in the future.