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The Rational Selection of Detonation Parameters and Support pattern for Ensuring the Tunnel Shape in Good Condition

Zhang Jianzhong Hexi Coal Mine of Fenxi Mining Industry Group Co. (Liulin Shanxi 033300)  
Choosing rationally the detonation parameters and support pattern, roadway failure of soft rock was avoided effectively, and thus the hidden troubles such as local methane accumulation caused by roof collapses has eliminated.
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