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Application of Controlled Blasting Technology on Signal Chamber Construction under Shaft Bottom

Cao Jihong LinHuan Coalmine of Huaibei Mining Group (Anhui 235039)  
Controlled blasting technology is introduced on signal chamber of pit-bottom and main haulage roadway, which is complex condition, lithological characters and highly security in this paper, different construction methods are applied in different places and ideal blasting effectiveness is acquired. it provides good experiences in similar condition.
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