Stress distribution of coal pillar with gob-side entry driving in the process of excavation & mining

The stress distribution of coal pillar with different width in the stage of excavation and min-ing was studied based on the theory analysis,numerical simulation,engineering practice,the similarities and differences of stress evolution of coal pillar and entity sidewall caused by different width of coal pillar was analyzed.The opinion was put forward that the infection of roadway driving and coal mining need considered simultaneously when determination the reasonable width for coal pillar.The results show that the proper width of coal pillar should large than six meters for the deformation is attenuation with the increased with of coal pillar.However,the increased width coal pillar such as eight meters not only have reduced contribution ratio to control the sidewall deformation in the stage of coal mining,but also caused top and floor deformation increased.Therefore,the reasonable width of coal pillar is eight meters.