Optimization of Blasting Parameters based on Analytic Hierarchy Process and Grey Correlation Analysis Method

The effect of bench blasting influenced the mining overall benefit directly. Based on the poor blasting effect and the high cost of Huangmailing open-pit mine,the blasting effect evaluation model on analytic hierarchy process and grey correlation analysis method was established,including the boulder yield,the rate of roots,the coefficient of loose,the distance of split,the blasting vibration,the distance of flying rocks and the specific charge. Five feasible blasting hole parameters as 5 m × 3. 5 m,5 m × 3. 7 m,5 m × 4 m,5. 5 m × 3. 5 m,5. 5 m × 3. 7 m were chosen in practical tests. The model was effective to evaluate the blasting effect and helpful to get the optimal blasting parameters with 5 m × 3. 7 m,bottom burden 3. 7 m and specific charge 0. 92 kg / m3. The optimal blasting parameters of the soft and hard waste rock was 5. 5 m × 3. 8 m,bottom burden 3. 8m and specific charge 0. 81 kg / m3. The optimized blasting parameters improved the blasting effect of Huangmailing open-pit mine effectively and reduced the production cost greatly.