Optimization of Open Pit Step Blasting Based on SPH
Aiming at the problems of uneven block size and high large-block rate in open-pit deep hole bench blasting,the empirical formula method is used to calculate the bench blasting parameters and determine the blasting scheme.The bench numerical model based on Smooth Particle Hydrodynamics(SPH)is established to study the rock mass damage and the stress between holes under the joint action of hole row spacing in deep hole bench blasting.The results show that the hole row spacing will affect the stress superposition between the blast holes.In the simulation process,SPH particles can well simulate the rock movement state and rock damage range during the blasting process.When the hole spacing is 8.5 m and the row spacing is 5.0 m,the blasting effect is the best.The simulation results are applied to the field test.The large block rate is reduced by 10.3％compared with that before optimization,and the average qualified rate of block is increased by 5.2％.The field test and the simulation results are highly consistent with the optimal blasting scheme,indicating that it is reasonable and feasible to use SPH numerical simulation method to study bench blasting.The research results can provide basis and reference for the selection of row spacing of related bench blasting holes.
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