APPLICATION OF SPECIAL EXPLOSIVE F OR SMOOTH BLASTING IN EXCAVATION O F DIVERSION TUNNEL

The pilot tunnel method w as used for excavation of a divers ion tunnel in poor geology conditi ons Using self made,small diameter and low velocity XD pipe explosive ,smooth blasting tests were conduc ted The testing results show that the damage of blasting to remainin g rockmass is reduced with even tu nnel contour and a half cast facto r of over 80% when using special X D explosive for smooth blasting In this paper,the performance of XD e xplosive was introduced and compar ed with that of small diameter Gur it explosive produced by Nitro Nob el Company in Sweden In addition,t he blasting parameters,blasting ef fect and the obtained economic ben efit were expounded