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Abstract Setting reasonable segment pillar is key for ensuring successful replacement and safety production of fully mechanized caving face in extra-thick coal seam of deep shaft. Taking the determination of segment pillar width in the first mining area of Xinjulong mine as the engineering background，firstly，the side abutment pressure distribution of fully mechanized caving face in extra-thick coal seam of deep shaft was studied by using microseismic monitoring，stress monitoring and theoretical calculation，and 20 m in width of low stress zone was realized. Secondly，the width of fractured zone in side coal mass of fully mechanized caving face in extra-thick coal seam of deep shaft was determined by using engineering analogy and numerical modelling，and about 3 m in width of fractured zone was found. Finally，various elements such as resources recovery，rockburst prevention and control，secondary disaster control and roadway support were considered comprehensively，and the reasonable width of segment pillar of fully mechanized caving face in extra-thick coal seam of deep shaft was determined as 5.0–7.2 m. Furthermore，the reasonableness of the segment pillar width was verified by using observation results of surface displacement of the gob-side entry. The results can provide a reference for segment pillar setting in other mines having similar mining conditions.
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Received: 21 September 2011
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2012, Vol. 31 
