Controlled Blasting Design of Shaft Excavation under High Voltage Line

The safety of high voltage line must be controlled strictly while excavating shaft under high voltage line.High voltage line has an important influence on blasting operation,and initiation network and protection measures must be selected properly.According to the characteristic of shaft controlled blasting,the layout of boreholes and blast parameters are optimized.From the view of economic benefits,initiation network and charge structure are analyzed and calculated detailly,and the blast result is well in experience.The designed scheme has high reliability,safety and good economic benefits,and can provide references for similar projects.