The application of electronic detonator in a rock-plug blasting

Underwater rock-plug blasting is a key control project of some priority hydropower project.According to the requirements of the design,this is a large diameter and super thick rock plug with 14.6m outside diameter,10.0 minlet diameter and 12.5 meters thick.Blasting site environment is extremely complex,the blasting should be conducted in 60 meters underwater,the biggest difficulty is to ensure the reliability of the blasting system under the pressure of 60 meters water,and the other problem is the rock plug must be broke through at the first time.To this end,we optimized the related blasting scheme and verified it by trail.The results showed that electronic detonator has high accuracy in delay index and excellent waterproof performance.Combined with central heading and small rock-plug,excellent results have been achieved in the blasting trail.We have got the target of decreasing the single fire explosive and the blasting vibration,and we also got a better control of blasting outline.At last,the optimized scheme was applied to formal rock-plug blasting,and the rock-plug was broke through at the first time.