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STUDY ON MECHANISM OF LARGE BLOCK FORMATION IN THE PARALLEL BLASTING COLUMN CUT IN SHAFT

Zong Qi(Huainan Institute of Mining, nhui 232001)  
Through theoretical analysis on the mechanism of the parallel blasthole column cut, this paper reaches such a conclusion that under the condition of constant rock and charging, the presence of large block is the main reason that the mutual action of blasting stress wave resulted in no draw stress zone and decreased draw stress zone, and earlier release of blasting energy from penetrating crake of adjacent blasthole.
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