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Abstract Taking one-hole bench blasting as prototype，the blasting experiment of concrete models with a weak intercalation is carried out. The motion state of intercalation in blasting process can be observed using high-speed digital camera，and the motion characteristics of intercalation and variation laws under the conditions of different charges，moisture contents and the minimum burdens are analyzed. The research results show that the clear motion images of intercalation more than 2–4 cm away from blast-hole center can be obtained by high-speed digital camera，which confirms the pushing action of blasting upon the weak intercalation adjacent to blast-hole；the maximum motion velocity of intercalation in concrete model blasting can reach 450 m/s；and with the increase of the distance from the blast-hole center，the motion velocity linearly decreases approximately and its decrease range is mainly affected by the moisture content and charge；the motion velocity of intercalation and the maximum motion distance increase with the increase of charge，moisture contents and the minimum burden；moreover，the charge plays an important role in the final motion distance of intercalation.
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Received: 21 April 2009
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