Research on the mechanisms and control measures of roof caving during shrinking period of working face with large mining height
Aiming at the problems of overlying concentrated coal pillars and gob-side entry retaining of adjacent working faces during the mining of 52606 fully mechanized working face in Daliuta Coal Mine,the roof caving mechanism and the distribution law of mine pressure during the shrinking period of working face were analyzed.The influence of overlying coal pillars and adjacent goafs on the stress distribution of the working face was simulated through numerical simulation.Based on the analysis and simulation results,preventive measures for strengthening support and roof weakening through hydraulic fracturing were formulated,effectively ensuring the shrinkage and retreat of the 52606 fully mechanized working face,and achieving safe and efficient mining.
shrinkage and retreat of working faceoverlying coal pillargob-side entry retaininghydraulic fracturing
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