Study on blasting damage partition for the slope in Dagushan iron mine

During open pit mine blasting,slope stability has been great affected by the slope blasting damage partition near slope blasting.A calculation model for slope blasting and the blasting vibration attenuation formula were built in the light of the practical situation during the blasting production in Dagushan iron mine.The numerical analysis software Geoslope was used to study the rock blasting damage range near slope blasting,then blasting vibration on the influence of the slope rock mass were analyzed under the conditions of-200-212 meters mining levels,and the damage range surrounding blasting zone were obtained with Sadaovsky empirical formula and PPV damage criterion.The results showed that away from the gun hole within 6.2meters for completely broken range of rock mass,6.2-12.4 meters for severe damage range,12.4-19.7 meters for minor damage range.Numerical analysis showed that the rock peak speed of particle with same distance from the blasting source would decrease with the increase of depth,the vibration wave velocity around the blasting area showed a funnel distribution fwhich agreed with the actual blasting situation.