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ANALYSIS AND TREATMENTS OF THE BACKBREAKING OF LONGHOLE BENCH BLASTING AT UNDER GROUND MINES

Liu Qinglin Xie Yuan You Haosheng(Beijing General Research Institute of Mining and Metallurgy,Beijing 100044)  
Backbreak may take place at the top and toe of the longhole because the toe cut and drilling drift is extra free face for bench blasting with column charge for bulk mining method at underground mines.The backbreak reasons and some mathods to avoid backbreak were discussed in this paper.
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