In order to solve the problem of step foundation caused by open-pit coal mine blasting,improve the economic benefits of the mine,and ensure normal production,the possible factors causing blasting foundation were explored by analyzing on-site blasting parameters.ANSYS/LS-DYNA numerical simulation software was used to construct four finite element models with ultra deep depths of 1.5 m,2.0 m,2.5 m,and 3.0 m,and the blasting effect was analyzed.The reasonable control of blasting foundation for ultra deep depth should be explored.The results show that as the depth increases,the damage effect shows a pattern of first increasing and then weakening.The stress wave effect under the condition of 1.5 m ultra deep is generally weaker than the other three schemes,and there is no significant difference in stress effect between the 2.0～3.0 m ultra deep schemes.Taking into account both on-site costs and construction factors,adopting 2 m ultra depth can effectively improve the foundation problem of on-site step blasting on the existing foundation.
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