The method of superdeep holes presplit blasting

The invention discloses a kind of methods of superdeep holes presplit blasting, cycle arrangement is spaced using presplitting blasthole (7), guiding blasthole (8), presplitting blasthole (7), is from bottom to top respectively to reinforce powder charge section h in presplitting blasthole (7) 1 , normal charge section h 2 , weaken powder charge section h 3 , filling section h 4 , reinforcement presplitting powder column (5 '), normal presplitting powder column (5), decrease presplitting powder column (5 ") are tied up on dividing primacord (1) respectively, are packed into presplitting blasthole (7)；Bottom reinforcement powder column (6) is continuously tied up on branch primacord (1 '), guiding blasthole (8) bottom is packed into；Primacord (1), branch primacord (1 ') is divided to overlap outside hole with main primacord, it is detonated with non-electrical millisecond delay detonating detonator, presplitting blasthole (7) and guiding blasthole (8) are detonated simultaneously, and advanced main blast hole at least 150ms.The present invention makes full use of the presplitting guiding role of guiding blasthole (8), preferably formation presplitting line, effectively avoids rock mass from hanging side phenomenon, reduces the amount of backbreaking, control the safety and stability of side slope.