Abstract: Guiyang Longdongbao Airport T2 terminal building with complex environment,large blasting volume,and the airport with large passenger traffic flows,many tall buildings and construction facilities.During the blasting construction,the safety of personals,traffics and buildings and facilities in the airport around the construction area should be guaranteed.The technical requirements of blasting construction under the above environmental conditions is high,the blasting construction is very difficult.The mediumlength hole blasting construction scheme based on digital electronic detonator is proposed.The optimal delay time is obtained by conducting many tests,the delay time (15~20 ms) is optimized.The engineering practice results show that the massive phenomena happened during the blasting process is not only prevented,the influence of blasting vibration to the airport environment and instrument facilities is controlled effectively,but also the blasting comprehensive costs is reduced significantly by the implementation of the mediumlength hole blasting scheme.The mediumlength blasting scheme proposed in this paper can provide some reliable reference for the similar engineering.

Key words: Digital electronic detonator, Mediumlength hole blasting, Delay time, Blasting fragmentation, Comprehensive cost