Abstract: In order to ensure the blasting operation safety during the period of excavation construction of a road in Hanshan County in Anhui Province,the milliseconds differential control blasting scheme is designed,the reasonable blasting parameters is calculated,and the influence of blasting vibration and blasting slungshot to buildings is discussed.The field blasting vibration monitoring results show that the blasting vibration velocity of the buildings around the blasting area distributed is lower than the corresponding safety allowed vibration velocity,the blasting slungshot can be controlled within the safety scope.Based on the above study results,the further discussion results show that the goal of blasting safety can be realized by taking the effective measures of adopting differential hole-by-hole blasting technique and select the reasonable differential time,design the direction of monomer blasting free surface effectively,using the explosive with low detonation velocity and uncoupled charging mode,ensure the hole plugging length and quality.The above blasting scheme designed in this paper and some relative blasting safety measures can provide some reliable reference for the similar road excavation blasting operation.

Key words: Road excavation blasting, Milliseconds differential control blasting scheme, Blasting vibration,Safety measures, Uncoupled charging mode