Refacing demolition technology and research about range tunnel railway

The refacing demolition is after the peripheral artillery eye detonation, first forms links up crevasse along each hole's central segment, then by the demolition gas function, causes the decomposition crag body to squander in the hole. Using the refacing demolition, through accurate rock drilling to the tunnel peripheral spot, then achieved the control to the crag body excavation outline, reduces ultra owes digs, finally it makes the adjacent formation to be stable and smooth.