It is the key to ensure smooth connection and safe mining of fully-mechanized top coal caving face by setting a reasonable segment pillar width.To guarantee the stability and effective water resisting capacity of bilateral segment pillar

an analytical model is established to calculate pillar stress.Pillar stability is assessed by means of numerical simulation and a borehole camera.The reasonable scheme of cutting top blasting successfully reduces the effect of mining-induced stress on the pillars in the vicinity of the3107 working face

accomplishes pillar stress optimization

and ensures safe mining.The study has a certain significance for determining the width of coal pillar and stress release of segment pillar with hard roof under similar mining conditions.