Smooth Blasting Techniques for Excavation of the Tunnel in Guiyang Project

In excavation of the E part of Dashishan tunnel of Guiyang hinge, the different blasting techniques , such as smooth blasting, millisecond blasting with noel detonators, M shape cutting, and space loading with detonator fuse were used to ensure the quality of the tunnel section. The blasting result shows that the optimized blasting scheme and blasting parameters were effective. The valuable reference has been provided for similar engineering of deep-hole millisecond blasting. The design of blasting scheme, the selection of blasting parameters, charging structure and priming network were introduced.