Research and Application of Efficient Construction Method for Smooth Blasting in Saudi Arabia NEOM Tunnel Project
The traditional tunnel smooth blasting charging structure is complex,requiring a lot of manpower to process the charge string in advance.The charging speed is slow,and the cost of labor and auxiliary materials is high.Moreover,the loose fixation of the charge roll is prone to cause its concentration,resulting in poor smooth blasting effect.Based on the construction habits and other external construction conditions,tunnel rock properties,drilling conditions,and types of blasting equipment in the location of the NEOM Tunnel Branch Project in Saudi Arabia,a smooth blasting charging structure consisting of a 40g/m high-energy detonating cord and No.2 rock emulsion explosive was designed.By changing the charging structure and method,the step of pre-processing the explosive string is eliminated,and manpower and auxiliary material investment are saved.Compared to traditional smooth blasting,it is not only more operable,time-consuming,and simple in charging structure,but also requires lower technical proficiency from blasting operators.The blasting test shows that the smooth effect of this construction method is better,and the residual hole rate reaches 88%～92%,which can effectively improve the smooth blasting construction efficiency,improve the smooth blasting effect,and reduce the construction cost of tunnel blasting excavation.
NETL
NSTL
万方数据
维普
