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Abstract In order to recover the residual coal left by small mine, U shaped steel+ grouting + pressure relief anchor bolt support system was given. U shaped steel+ grouting supporting grouting paste and shaping roadway, grouting filling the goaf sealed air way, pressure relief improving the strength of grouting and balancing the stress in goaf, the technology enable to make sure the safe mining and stable roadway surrounding rock and realize the recovery of residual coal efficiently.
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