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Treatment of Mined-out Area Ⅳ in Mines

DING Jin-gang~(1,2),XU Lin-rong~1(1.School of Civil Engineering and Architecture,Central South University,Changsha 410075,China;2.Changsha Engineering & Research Institute of Nonferrous Metallurgy,Changsha 410011,China)  
In order to ensure safety exploitation below the mined-out area Ⅳ,several projects and designing the blasting parameters are compared,and the safety,economy,efficiency results were achieved with the project of bar-charged chamber blasting,which lays the foundation for later development of the enterprise.
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