Determination of coal pillar width for gob?side entry driving in isolated coal face and its control in deep soft?broken coal seam: A case study

Large deformation control of surrounding rock in deep soft-broken coal roadway has always been a key scientific and technological problem restricting the resources exploitation. Taking gob-side entry driving (GED) isolated face under as research object, prominent difficulties were clarified. Through numerical simulation, evolution laws deviatoric stress plastic zone GED different pillar widths studied. Combined with rational calculation, reasonable width was determined to be 7.0 m. The study shows that severe disturbance distance front section is 22 m, makes it clear roof are areas. A subregional asymmetric combined support technology named anchor cable truss + solid single prop reinforced 25 m ahead proposed. field application ground pressure observation results show good effect achieved after adopting 7 width. have important reference significance for safe mining resources.