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Rock Damnification by Smooth Blasting of Different Charge Structures

ZHANG Zhi-cheng,PU Chuan-jin,SHI Jin-jin(Southwest University of Science and Technology,Mianyang 621010,China)  
Different charge structures of smooth blasting are introduced,and blasting of dirrerent charge structures for detonation pressure on hole wall is studied theoretically.Damnification of different charge blasting for remaining rock of slope is studied according to detection of sonic wave velocity.It can be concluded that damnification of double-pipe protecting borehole wall by smooth blasting is the weakest.
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