Experimental Study On Accumulatived And Decouple Charge Of Pre-splitting Blasting In The East Anshan Iron Mine

Based on current theory and practice, from accumulativedeffect uncouple charge and pre-splitting blasting and other aspects, elaborates thesignificance of the subject, and to the work involved in research related to theoreticalanalysis and summary; through finite element simulation software ANSYS/LS-DYNA poly can accumulatived and decouple charge of Pre-splitting blasting,blasting parameters for the determination of reasonable engineering practice andoptimizing blasting effect laid the theoretical foundation; finally Industry feedbackthrough simulation experiments, and to provide a more reasonable blasting parametersfor the further improvement of computer simulation and industrial test deficiencies.The main contents and conclusions of the results are as follows.⑴Collect and organize a large number of domestic and foreign researchliterature on the cohesive energy, which is decoupled charge, pre-splitting blastingDynamic testing and other aspects of the induction and summarized as a basis toguide further research.⑵From the nature of the factors that affect the pre-split blasting paperintroduces the mine geology and mechanical properties of several ore rock; polyblasting theory can decoupling charge technology, the pre-split blasting, etc., as thefocus of the theory are discussed, as accumulatived and decouple charge ofpre-splitting blasting techniques and the development of new accumulatived grainsprovide a reliable theoretical basis.⑶From the numerical simulation angles, highlights the ANSYS/LS-DYNAdynamic analysis methods, and to simulate this experiment involved about cell types,material models, calculation methods in detail. On this basis, the number of trials toselect a representative group of pre-splitting blasting numerical simulation, the resultsshowed that there is decoupling coefficient between the ratio and the maximum stressof stress concentrators direction and the direction perpendicular to the cohesiveenergy on some relevance, the maximum stress σmaxof the hole wall couplingcoefficient RAand non-statistical analysis, we can see the relationship between thetwo is a power function.⑷Several computer simulation coupling coefficient does not appear, use of newindustrial trials shaped grains; the actual effect of the pre-formed cracks, size, porosityand help the body banbishan smoothness of the website statistics and analysis;Meanwhile, combine IDTS-3850Seismograh blasting vibration recorder monitoringand data analysis. The results showed that accumulatived and decouple chargepre-splitting blasting effect not only to sew, to help improve the flatness of the surface,the half wall porosity has increased significantly, but also reduces vibration rock acertain level, while maintaining stability and help the body for subsequent provides abetter basis.