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| EXPERIMENTAL STUDY OF DYNAMIC FRACTURE EFFECT OF BLASTING CRACK IN SLOTTED CARTRIDGE DECOUPLING CHARGE BLASTING |
| YANG Renshu1，2，WANG Yanbing1 |
(1. School of Mechanics and Architecture Engineering，China University of Mining and Technology，Beijing 100083，China；
2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，
Beijing 100083，China) |
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Abstract Explosion load test system of digital laser dynamic caustics is used to analyze the dynamic fracture effect of blasting crack with different charging structures. Mechanism of directional fracture blasting with slotted cartridge is studied and the difference of dynamic energy release rate between principal crack and secondary crack is compared. The results show that the blasting effect is best when the decoupling coefficient ?1 = 1.67. The propagation velocity and dynamic stress intensity factor of principal crack show a downward trend in the mass，and is up to a smaller peak in the mid- and late-expansion processes. As the buffer layer between explosive product and blasting hole wall，the plasticine medium transfers energy well. The dynamic energy release rate values of secondary crack as a whole is less than that of two principal cracks.
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Received: 09 September 2012
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2013, Vol. 32 
