Science and Technology of Energetic Materials

Vol.65, No.2 (2004)発破特集号

Research paper

Simulation of blast vibration controlled by delay blasting
Gento Mogi, Tsuyoshi Adachi, Kouji Tamada, Ayano Ihara, Tomoaki Arimatsu,Hiroshi Kaburaki, Katsuhiro Eguchi, and Yuji Ogata


Assuming that the vibration waves emitted by successive detonations in the near by holes, each having an identical set of explosives, are identical each other, a proper delay between holes, which significantly reduces the peak particle velocity (PPV) at any point of interest, can be designed, based on the theory of superposition of waves. Blast vibrations were measured in situ in order to design an efficient production blasting in an open pit limestone quarry, where the pit floor is approaching an abandoned stope whose roof must be maintained stable to prevent the pit floor from caving in. A relationship between PPV at the measuring point and the distance to epicenter was considered. Also PPVs based on different criteria, i.e. PPV minimization and auto-correlation minimization, were compared. Finally, two dimensional FEM analysis, based on the data of the in situ blast vibration measurements, was performed to estimate the distribution of the PPVs around a particular target point.

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