摘要
Abstract
In order to improve the blasting effect of rock bench in Xiwan Open-Pit Coal Mine,the explosiveness of different types of rocks was defined based on the theory of rock blasting action.LS-DYNA numerical simulation software was used to construct FEM dense hole arrangement model and FEM-SPH buffer model,and the optimal dense hole arrangement length and buffer thickness were obtained.Particle swarm optimization(PSO)was used to optimize the rock edge recogni-tion threshold of Canny recognition algorithm,and a PSO-Canny explosion pile size recognition model was constructed.The on-site usage plan was used as the control group,and the recognition effect was compared with Split-Desktop 4.0 blasting block size analysis software.The results indicate that the top mudstone belongs to low wave impedance rocks and undergoes plastic failure under the action of explosive gas,while the bottom sandstone belongs to medium impedance rocks,which un-dergo quasi brittle failure under the combined action of stress waves and explosive gases.Based on numerical simulation re-sults,the improved blasting technology scheme was determined to be a 4 m dense hole arrangement scheme and an 8.5 m buffer scheme.According to the rock blasting test in Xiwan Open-Pit Coal Mine,the block rates for each scheme were de-termined to be 3.50%,3.10%,and 2.85%,respectively.After adopting 4 m dense hole arrangement and8.5 m buffer schemes,the rock blasting fragmentation rate decreased by 0.40%and 0.65%,respectively.By comparing the results with the Split-Desktop 4.0 block size analysis software,it was found that the recognition errors of the three schemes were 6%,3%,and 2%,respectively.关键词
露天深孔爆破/爆破控制/加密布孔/压渣爆破/爆堆块度识别/PSO-Canny模型Key words
open-pit deep-hole blasting/blasting control/dense hole arrangement/buffer blasting/blast pile frag-ments recognition/PSO-Canny model分类
矿业与冶金
