西湾露天煤矿岩石台阶爆破中块度的控制研究

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[分类号] TD235.3

Block Size Control of Rock Bench Blasting in Xiwan Open-Pit Coal Mine

LI Yanfei， LI Gaoyuan，MA Li Xiwan Open-Pit Coal Mine，Shaanxi Shenyan Coal Co.，Ltd.，China Energy（Shaanxi Yulin，719000））  Colege of Energy and Mining Enginering，Xi'an University of Science and Technology（Shaanxi Xi'an，710054）

[ABSTRACT]Inorder to improve the blasting effctof rock bench in Xiwan Open-Pit Coal Mine，the explosivenessof diferent types ofrocks was definedbasedonthetheoryofrock blasting action.LS-DYNA numerical simulation software was used to construct FEMdense hole arrangement modelandFEM-SPHbuffer model，and theoptimal dense holearrangement length adbuffer thickness were obtained.Particle swarm optimization（PSO）was used tooptimizetherock edge recognition thresholdof Canny recognition algorithm，and a PSO-Canny explosion pile size recognition modelwas 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.Theresults indicate that thetop mudstone belongs to low wave impedance rocksand undergoes plastic failureunder the action of explosive gas，while the botomsandstone belongs to medium impedance rocks，which undergo quasi britle failureunder thecombined actionof stress waves and explosive gases.Based on numerical simulation results，the improved blasting technologyscheme was determined to be a4 m dense hole arrangement scheme andan8.5m bufer scheme.According to the rock blasting test in Xiwan Open-Pit Coal Mine，the block rates for eachscheme were determined to be 3.50% ， 3.10% ，and 2.85% ，respectively. After adopting 4 m dense hole arrangement and 8.5 m buffer schemes，the rock blasting fragmentation rate decreased by 0.40% and 0.65% ，respectively. By comparing the results withthe Split-Desktop 4.Oblock sizeanalysissoftware，itwas found thattherecognitionerors of thethree schemes were （20 6% ， 3% ，and 2% ，respectively.

[KEYWORDs]open-pit deep-hole blasting；blasting control；densehole arrangement；bufer blasting；blast pile fragmentsrecognition；PSO-Canny model

0 引言

露天矿爆破后的岩石块度是影响现场采装效率的关键因素之一。（剩余14741字）