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| EXPERIMENTAL STUDY AND APPLICATION OF DIRECTIONAL FOCUSED ENERGY BLASTING IN DEEP BOREHOLES |
| LIU Jian1，2，LIU Zegong1，2，GAO Kui1，2，MA Yankun1，2，LI Zhongqing1，2，Guo Linjie1，2 |
| (1. College of Energy and Safety，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry，Anhui University of Science and Technology，Huainan，Anhui 232001，China) |
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Abstract In order to study the crack and stress evolutions caused by the directional focused energy blasting in deep borehole，an experiment system was constructed，and a series of laboratory and field experiments together with the field experiments of directional focused energy blasting were carried out. The results show that the energy of directional blasting mainly concentrated in focusing direction and then penetrated the coal sample with the cracks in focusing direction much longer than those in other directions. Because of the effect of directional focused energy blasting，the mechanical properties of the samples in focusing direction were changed much more significantly than in other directions. The permeability after directional focused energy blasting in coal seam was found increased. The maximum gas drainage volume was 10–40 times of the original one，with the effective radius of gas drainage reaching 7 meters. Besides，the directional focused energy blasting made little damage to the roof and floor of coal seam and the surround rock of roadway.
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Received: 05 May 2014
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2014, Vol. 33 
