The construction of a blasting network is challenging,with high risks and costs associated with blasting equipment.Considering the geological structure,physical and mechanical properties of the excavation target,and the detonation characteristics of the detonating cable,a delayed detonation network was designed to combine a digital e-lectronic detonator and a detonating cord.This design replaced the digital electronic detonator with the detonating cord in auxiliary and peripheral holes within the same section.In contrast,a single digital electronic detonator was used to initiate detonation to reduce the networking complexity and improve the overall reliability of the network.Field tests conducted at Guangshan iron mine and Gemstone phosphate mine verified the applicability of this method in different mineral environments.The results show that the fusion delay detonation network can significantly reduce detonation equipment costs,simplify initiation network construction,improve cutting effectiveness,and reduce safety risks during excavating small-section roadways in iron mines.However,during the underground phosphate rock test,the unique geological structure and the properties of phosphate rock prevented the designed network from achieving the expected results,indicating a need for further research.
small section excavationdigital electronic detonatordetonating cordfusedelayed initiation network
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