The Least Thickness Determination of Reservation Rock Pillar in Crosscut Uncovering Outburst Seam

Aiming at the present situation of crosscut uncovering outburst seam relying on experience,from the perspective of rock mechanics,using fast Lagrangian numerical method,reservation thickness of 5,3,2 and 1 m rock pillar were studied when Dongshan coal mine Dong’er crosscut uncovered 3^# outburst seam.Research results visually showed the stress distribution and plastic damage of different rock pillars beared in crosscut tunneling process,which determined a reasonable minimum reservation rock pillar thickness.