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Study on action law of bolted surrounding rock in coal roadway

HU Ji - ping,WANG Jian - li (Xingtai Mine of Xingtai Mining Group,Xingtai 054026,China).  
In 1997, the Xingtai Mine succeeded in using bolting boltmesh supporting tech. in coal roadway(supporting the top coal along the bottom). By analyzing and observing the strata pressure, studies have been finished on the action law in coal - drilling and mining, which is the scientific evidence of the spreading of supporting tech.
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