Analysis of blasting effect of asymmetric V-shaped oblique initiation network in complex rock mass

In order to reduce the arid zone of deep concave open-pit coal mine in complicated rock mass blasting of rock mass under the condition of large and close the blasting vibration effect of to the world stage,based on xinjiang toksun county qomi assorted open-pit coal mine complex rock mass structure,lithologic characteristics of rock mass,the fracture surface structure,morphology and joint,fracture analysis of the influence of the change trend and the analysis of blasting effect on safety and stability of slope research,put forward:①near the slope stripping operations of blasting rock steps,is at least one side free surface and free surface,the initiation point is located at the junction of steps and the upper lateral positive free surface explosive detonation outside-in along the diagonal direction,avoid affected by joints,fractures and structural plane the blasting energy concentrated effect in a blast disease in the blasting area and appear;②optimizing asymmetric unilateral to a free surface conductivity tube plus "cross" V-shaped slash more paragraph a unit dose milliseconds differential between successive initiation blasting network,blasting energy along Baoqu diagonal slash direction dispersion effect and the balance of blasting effect,different from the straight line between and by differential blasting hole millisecond blasting between the holes after the blasting impact effect,vibration on slope hazards;③coupled with piecewise or continuous concentrated charge plus the detonator and the conductance tube detonator expanded anfo explosive hole by hole of milliseconds differential blasting technology in charge more instantaneous detonation,the explosive compression stress peak value along with the loading surface increases the distance to the hole wall down,reduce the excess of the stress wave in rock fragmentation and the blasting effectiveness is more effective. Blasting experiment results show that the key technology used in blasting and the blasting rock block rate is 5%～8% lower,sedimentation height is less than 2 m,blasting energy distribution more uniform,both is advantageous to the security and stability of slope,and convenient for 4 m3 hydraulic backhoe loading,to solve the problem of complex rock deep sunken open pit blasting technology in arid areas are for reference purposes.